文章目录
1.jQuery操作节点 1.查找节点,修改属性
2.创建节点 1.基本介绍 2.内部插入 3.外部插入 4.小结
5.插入元素实例 6.移动元素实例
3.删除节点
4.复制节点
5.替换节点
2.属性操作 3.`.class`样式操作
4.获取HTML文本和值
5.常用遍历节点方法
6.CSS-DOM操作
7.多选框应用案例
8.页面加载完毕触发方式 9.作业 1.作业一 2.作业二 3.作业三(处理布尔属性使用prop) 4.作业四
1.jQuery操作节点
1.查找节点,修改属性
1.基本介绍
2.切换图片案例
<! DOCTYPE html >
< html lang = " en" >
< head>
< meta charset = " UTF-8" >
< title> 操作节点的属性</ title>
< script type = " text/javascript" src = " ./jquery/jquery-3.6.0.min.js" > </ script>
< script type = " text/javascript" >
$ ( function ( ) {
$ ( "button" ) . click ( function ( ) {
$ ( "img" ) . attr ( "src" , "./image/1.png" )
} )
} ) ;
</ script>
</ head>
< body>
< img src = " ./image/2.png" height = " 300" />
< br/>
< button> 点击切换图片</ button>
</ body>
</ html>
2.创建节点
1.基本介绍
2.内部插入
3.外部插入
4.小结
1.插入方法说明
**A.append(B):**A内部的最后添加B **A.prepend(B):**A内部的最前面添加B **A.after(B):**A的后面添加B **A.before(B):**A的前面添加B
2.两种插入方法的区别
在直接可以找到子元素的情况下,内部插入和外部插入的作用是相同的,建议使用外部插入 如果只能找到父元素,插入子元素只能使用内部插入法
5.插入元素实例
<! DOCTYPE html >
< html lang = " en" >
< head>
< meta charset = " UTF-8" >
< title> 创建节点-应用实例</ title>
< style type = " text/css" >
div, span {
width : 140px;
height : 140px;
margin : 20px;
background : #9999CC;
border : #000 1px solid;
float : left;
font-size : 17px;
font-family : Roman;
}
div.mini {
width : 30px;
height : 30px;
background : #CC66FF;
border : #000 1px solid;
font-size : 12px;
font-family : Roman;
}
</ style>
< script type = " text/javascript" src = " ../script/jquery-3.6.0.min.js" > </ script>
< script type = " text/javascript" >
$ ( function ( ) {
$ ( "#b1" ) . click ( function ( ) {
var cq_li = document. createElement ( "li" ) ;
cq_li. setAttribute ( "id" , "cq" )
cq_li. setAttribute ( "name" , "chongqing" )
cq_li. innerText = "重庆" ;
var elementById = document. getElementById ( "sh" ) ;
elementById. append ( cq_li) ;
} )
$ ( "#b2" ) . click ( function ( ) {
var $li = $ ( "<li id=\"cq\" name=\"chongqing\">重庆</li>" ) ;
$ ( "ul li[id='sh']" ) . after ( $li) ;
} )
$ ( "#b3" ) . click ( function ( ) {
var $cd = $ ( "<li id=\"cd\" name=\"chengdu\">成都</li>" ) ;
$ ( "#bj" ) . before ( $cd)
} )
$ ( "#b4" ) . click ( function ( ) {
var $cd = $ ( "<li id=\"cd\" name=\"chengdu\">成都</li>" ) ;
$ ( "#bj" ) . after ( $cd)
} )
$ ( "#b5" ) . click ( function ( ) {
var $cd = $ ( "<li id=\"cd\" name=\"chengdu\">成都</li>" ) ;
$ ( "#jl" ) . before ( $cd)
} )
} )
</ script>
</ head>
< body>
< ul id = " city" >
< li id = " bj" name = " beijing" > 北京</ li>
< li id = " sh" name = " shanghai" > 上海</ li>
< li id = " jl" name = " jilin" > 吉林</ li>
< li id = " my" name = " mianyang" > 绵阳</ li>
</ ul>
< input type = " button" id = " b1" value = " 添加重庆li到 上海下(使用dom的传统方法)" /> < br/> < br/>
< input type = " button" id = " b2" value = " 添加重庆li到 上海下" /> < br/> < br/>
< input type = " button" id = " b3" value = " 添加成都li到 北京前" /> < br/> < br/>
< input type = " button" id = " b4" value = " 添加成都li到 北京和上海之间" /> < br/> < br/>
< input type = " button" id = " b5" value = " 添加成都li到 吉林前面" /> < br/>
</ body>
</ html>
6.移动元素实例
<! DOCTYPE html >
< html lang = " en" >
< head>
< meta charset = " UTF-8" >
< title> 移动节点</ title>
< script type = " text/javascript" src = " ../script/jquery-3.6.0.min.js" > </ script>
< script type = " text/javascript" >
$ ( function ( ) {
$ ( "#b1" ) . click ( function ( ) {
$ ( "#tj" ) . after ( $ ( "#fk" ) ) ;
} )
$ ( "#b2" ) . click ( function ( ) {
$ ( "#city" ) . append ( $ ( "#fk" ) )
} )
} )
</ script>
</ head>
< body>
您喜欢的城市:< br>
< ul id = " city" >
< li id = " bj" name = " beijing" > 北京</ li>
< li id = " sh" name = " shanghai" > 上海</ li>
< li id = " tj" name = " tianjin" > 天津</ li>
</ ul>
您爱好的游戏:< br>
< ul id = " game" >
< li id = " fk" name = " fakong" > 反恐</ li>
< li id = " cq" name = " chuangqi" > 传奇</ li>
</ ul>
< input type = " button" id = " b1" value = " 使用after插入法 把反恐li移动天津后" /> < br/> < br/>
< input type = " button" id = " b2" value = " 使用append插入法 把反恐li移动天津后" /> < br/> < br/>
</ body>
</ html>
3.删除节点
1.基本介绍
2.代码实例
<! DOCTYPE html >
< html lang = " en" >
< head>
< meta charset = " UTF-8" >
< title> 删除节点-应用实例</ title>
< script type = " text/javascript" src = " ../script/jquery-3.6.0.min.js" > </ script>
< script type = " text/javascript" >
$ ( function ( ) {
$ ( "#b1" ) . click ( function ( ) {
$ ( "p" ) . remove ( ) ;
} )
$ ( "#b2" ) . click ( function ( ) {
$ ( "p" ) . empty ( ) ;
} )
$ ( "#b3" ) . click ( function ( ) {
$ ( "#sh" ) . remove ( ) ;
} )
} ) ;
</ script>
</ head>
< body>
您喜欢的城市:< br>
< ul id = " city" >
< li id = " bj" name = " beijing" > 北京</ li>
< li id = " sh" name = " shanghai" > 上海</ li>
< li id = " tj" name = " tianjin" > 天津</ li>
</ ul>
您爱好的游戏:< br>
< ul id = " game" >
< li id = " fk" name = " fakong" > 反恐</ li>
< li id = " cq" name = " chuangqi" > 传奇</ li>
</ ul>
< p> Hello</ p> how are < p> you?</ p>
< p name = " test" > Hello, < span> Person</ span> < a href = " #" > and person</ a> </ p>
< input type = " button" value = " 删除所有p" id = " b1" />
< input type = " button" value = " 所有p清空" id = " b2" />
< input type = " button" value = " 删除上海这个li" id = " b3" />
</ body>
</ html>
4.复制节点
1.基本介绍
2.代码实例
<! DOCTYPE html >
< html lang = " en" >
< head>
< meta charset = " UTF-8" >
< title> 复制节点-应用实例</ title>
< script type = " text/javascript" src = " ../script/jquery-3.6.0.min.js" > </ script>
< script>
$ ( function ( ) {
$ ( "p" ) . click ( function ( ) {
alert ( "段落的内容= " + $ ( this ) . text ( ) )
} )
$ ( "p" ) . clone ( true ) . insertAfter ( $ ( "button" ) )
} )
</ script>
</ head>
< body>
< button> 保存</ button>
< br> < br> < br> < br> < br>
///< br>
< p> 段落1</ p>
< p> 段落2</ p>
< p> 段落3</ p>
< p> 段落4</ p>
< p> 段落5</ p>
</ body>
</ html>
5.替换节点
1.基本介绍
2.代码实例
<! DOCTYPE html >
< html lang = " en" >
< head>
< meta charset = " UTF-8" >
< title> 替换节点-应用实例</ title>
< script type = " text/javascript" src = " ../script/jquery-3.6.0.min.js" > </ script>
< script type = " text/javascript" >
$ ( function ( ) {
$ ( "#1" ) . click ( function ( ) {
$ ( "p" ) . replaceWith ( "<a href=\"www.baidu.com\">点击跳转到百度</a><br>" )
} )
$ ( "#2" ) . click ( function ( ) {
var $button = $ ( "<button>dom对象按钮</button><br>" ) ;
$ ( "p" ) . replaceWith ( $button)
} )
} ) ;
</ script>
</ head>
< body>
< h1> 节点替换</ h1>
< p> Hello</ p>
< p> jquery</ p>
< p> World</ p>
< button id = " 1" > 点击使用超链接替换</ button>
< button id = " 2" > 点击使用dom对象替换</ button>
</ body>
</ html>
2.属性操作
3..class
样式操作
1.基本介绍
2.代码实例
<! DOCTYPE html >
< html lang = " en" >
< head>
< meta charset = " UTF-8" >
< title> 查找节点</ title>
< style type = " text/css" >
div {
width : 140px;
height : 140px;
margin : 20px;
float : left;
border : #000 1px solid;
background : red;
}
.one {
width : 140px;
height : 140px;
margin : 20px;
background : #9999CC;
border : #000 1px solid;
float : left;
font-size : 17px;
font-family : Roman;
}
</ style>
< script type = " text/javascript" src = " ../script/jquery-3.6.0.min.js" > </ script>
< script type = " text/javascript" >
$ ( function ( ) {
$ ( "#b1" ) . click ( function ( ) {
$ ( "#first" ) . attr ( "class" , "one" ) ;
} )
$ ( "#b2" ) . click ( function ( ) {
$ ( "#first" ) . addClass ( "one" ) ;
} )
$ ( "#b3" ) . click ( function ( ) {
$ ( "#first" ) . removeClass ( "one" ) ;
} )
$ ( "#b4" ) . click ( function ( ) {
$ ( "#first" ) . toggleClass ( "one" ) ;
} )
$ ( "#b5" ) . click ( function ( ) {
alert ( $ ( "#first" ) . hasClass ( "one" ) )
} )
} ) ;
</ script>
</ head>
< body>
< input type = " button" value = " 获取 class 和设置 class 都可以使用 attr() 方法来完成(给id 为first添加 .one 样式)"
id = " b1" /> < br/> < br/>
< input type = " button" value = " 追加样式: addClass() (给id 为first添加 .one 样式)" id = " b2" /> < br/> < br/>
< input type = " button"
value = " 移除样式: removeClass() --- 从匹配的元素中删除全部或指定的 class(给id 为first删除 .one 样式) "
id = " b3" /> < br/> < br/>
< input type = " button"
value = " 切换样式: toggleClass() (给id 为first切换 .one 样式) --- 控制样式上的重复切换.如果类名存在则删除它, 如果类名不存在则添加它"
id = " b4" /> < br/> < br/>
< input type = " button"
value = " 判断是否含有某个样式: hasClass() --- 判断元素中是否含有某个 class, 如果有, 则返回 true; 否则返回 false"
id = " b5" /> < br/> < br/>
< div id = " first" > first</ div>
< div id = " second" > second</ div>
</ body>
</ html>
4.获取HTML文本和值
1.基本介绍
2.案例
<! DOCTYPE html >
< html lang = " en" >
< head>
< meta charset = " UTF-8" >
< title> Title</ title>
< script src = " https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js" > </ script>
< script>
$ ( function ( ) {
$ ( "input" ) . blur ( function ( ) {
if ( $ ( this ) . val ( ) == "" ) {
$ ( this ) . val ( "请输入用户名" ) ;
}
} )
$ ( "input" ) . focus ( function ( ) {
if ( $ ( this ) . val ( ) == "请输入用户名" ) {
$ ( this ) . val ( "" ) ;
}
} )
} )
</ script>
</ head>
< body>
< input type = " text" value = " 请输入用户名" >
< button> 登录</ button>
</ body>
</ html>
5.常用遍历节点方法
1.基本介绍
2. 代码实例
<! DOCTYPE html >
< html lang = " en" >
< head>
< meta charset = " UTF-8" >
< title> 常用遍历节点方法-应用实例</ title>
< style type = " text/css" >
div, span {
width : 140px;
height : 60px;
margin : 20px;
background : #9999CC;
border : #000 1px solid;
float : left;
font-size : 17px;
font-family : Roman;
}
</ style>
< script type = " text/javascript" src = " ../script/jquery-3.6.0.min.js" > </ script>
< script type = " text/javascript" >
$ ( function ( ) {
$ ( "#b1" ) . click ( function ( ) {
var $children = $ ( "div[class='one']" ) . children ( ) . eq ( 1 ) ;
alert ( $children. text ( ) )
} )
$ ( "#b2" ) . click ( function ( ) {
var nextAll = $ ( "div[class='one']" ) . nextAll ( ) ;
nextAll. each ( function ( ) {
console. log ( $ ( this ) . text ( ) )
} )
} )
$ ( "#b3" ) . click ( function ( ) {
var prevAll = $ ( "div[class='one']" ) . prevAll ( ) ;
var prev = $ ( "div[class='one']" ) . prev ( ) ;
alert ( prev. text ( ) )
prevAll. each ( function ( ) {
console. log ( $ ( this ) . text ( ) )
} )
} )
$ ( "#b4" ) . click ( function ( ) {
$ ( "div[class='one']" ) . siblings ( ) . filter ( "div" ) . each ( function ( ) {
console. log ( $ ( this ) . text ( ) )
} )
} )
} )
</ script>
</ head>
< body>
< input type = " button" value = " 查找所有子元素 (class 为 one 的div的)" id = " b1" /> < br/> < br/>
< input type = " button" value = " 获取后面的同辈元素 (class 为 one 的div的)" id = " b2" /> < br/> < br/>
< input type = " button" value = " 获取前面的同辈元素 (class 为 one 的div的)" id = " b3" /> < br/> < br/>
< input type = " button" value = " 获取所有的同辈元素 (class 为 one 的div的)" id = " b4" />
< hr/>
< div>
ccccccc
</ div>
< p class = " one" >
ccccccc
</ p>
< div class = " one" >
dfsd
< div id = " one" >
XXXXXXXXX one
</ div>
< div id = " two" >
XXXXXXXXX two
</ div>
< div id = " three" >
XXXXXXXXX three
</ div>
< div id = " four" >
XXXXXXXXX four
</ div>
</ div>
< div>
tttttttttt
</ div>
< div>
aaaaaaa
</ div>
< div> bbbbbb</ div>
< p> hello, pp</ p>
</ body>
</ html>
6.CSS-DOM操作
1.基本介绍
2.代码实例
<! DOCTYPE html >
< html lang = " en" >
< head>
< meta charset = " UTF-8" >
< title> css-dom操作</ title>
< script type = " text/javascript" src = " ../script/jquery-3.6.0.min.js" > </ script>
< script type = " text/javascript" >
$ ( function ( ) {
$ ( "#b1" ) . click ( function ( ) {
var width = $ ( "img" ) . width ( ) ;
alert ( width)
var offset = $ ( "img" ) . offset ( ) ;
alert ( "top=" + offset. top)
alert ( "left=" + offset. left)
} )
} )
</ script>
</ head>
< body>
< br/> < br/> < br/>
hello,world~< img src = " ../image/1.png" width = " 200" >
< button id = " b1" type = " button" > 获取图片信息</ button>
</ body>
</ html>
7.多选框应用案例
1.题目
2.代码
<! DOCTYPE html >
< html lang = " en" >
< head>
< meta charset = " UTF-8" >
< title> 多选框应用</ title>
< style type = " text/css" >
BODY {
font-size : 12px;
margin : 0px 0px 0px 0px;
overflow-x : auto;
overflow-y : auto;
background-color : #B8D3F4;
}
.default_input {
border : 1px solid #666666;
height : 18px;
font-size : 12px;
}
.default_input2 {
border : 1px solid #666666;
height : 18px;
font-size : 12px;
}
.nowrite_input {
border : 1px solid #849EB5;
height : 18px;
font-size : 12px;
background-color : #EBEAE7;
color : #9E9A9E;
}
.default_list {
font-size : 12px;
border : 1px solid #849EB5;
}
.default_textarea {
font-size : 12px;
border : 1px solid #849EB5;
}
.nowrite_textarea {
border : 1px solid #849EB5;
font-size : 12px;
background-color : #EBEAE7;
color : #9E9A9E;
}
.wordtd5 {
font-size : 12px;
text-align : center;
vertical-align : top;
padding-top : 6px;
padding-right : 5px;
padding-bottom : 3px;
padding-left : 5px;
background-color : #b8c4f4;
}
.wordtd {
font-size : 12px;
text-align : left;
vertical-align : top;
padding-top : 6px;
padding-right : 5px;
padding-bottom : 3px;
padding-left : 5px;
background-color : #b8c4f4;
}
.wordtd_1 {
font-size : 12px;
vertical-align : top;
padding-top : 6px;
padding-right : 5px;
padding-bottom : 3px;
padding-left : 5px;
background-color : #516CD6;
color : #fff;
}
.wordtd_2 {
font-size : 12px;
text-align : right;
vertical-align : top;
padding-top : 6px;
padding-right : 5px;
padding-bottom : 3px;
padding-left : 5px;
background-color : #64BDF9;
}
.wordtd_3 {
font-size : 12px;
text-align : right;
vertical-align : top;
padding-top : 6px;
padding-right : 5px;
padding-bottom : 3px;
padding-left : 5px;
background-color : #F1DD34;
}
.inputtd {
font-size : 12px;
vertical-align : top;
padding-top : 3px;
padding-right : 3px;
padding-bottom : 3px;
padding-left : 3px;
}
.inputtd2 {
text-align : center;
font-size : 12px;
vertical-align : top;
padding-top : 3px;
padding-right : 3px;
padding-bottom : 3px;
padding-left : 3px;
}
.tablebg {
font-size : 12px;
}
.tb {
border-collapse : collapse;
border : 1px outset #999999;
background-color : #FFFFFF;
}
.td2 {
line-height : 22px;
text-align : center;
background-color : #F6F6F6;
}
.td3 {
background-color : #B8D3F4;
text-align : center;
line-height : 20px;
width : 100px;
}
.td4 {
background-color : #F6F6F6;
line-height : 20px;
}
.td5 {
border : #000000 solid;
border-right-width : 0px;
border-left-width : 0px;
border-top-width : 0px;
border-bottom-width : 1px;
}
.tb td {
font-size : 12px;
border : 2px groove #ffffff;
}
.noborder {
border : none;
}
.button {
border : 1px ridge #ffffff;
line-height : 18px;
height : 20px;
width : 45px;
padding-top : 0px;
background : #CBDAF7;
color : #000000;
font-size : 9pt;
}
.textarea {
font-family : Arial, Helvetica, sans-serif, "??" ;
font-size : 9pt;
color : #000000;
border-bottom-width : 1px;
border-top-style : none;
border-right-style : none;
border-bottom-style : solid;
border-left-style : none;
border-bottom-color : #000000;
background-color : transparent;
text-align : left
}
</ style>
< script type = " text/javascript" src = " ../script/jquery-3.6.0.min.js" > </ script>
< script type = " text/javascript" >
$ ( function ( ) {
$ ( "select option" ) . dblclick ( function ( ) {
var attr = $ ( this ) . parent ( ) . attr ( "id" ) ;
if ( attr == "first" ) {
$ ( "#second" ) . append ( $ ( this ) )
}
if ( attr == "second" ) {
$ ( "#first" ) . append ( $ ( this ) )
}
} ) ;
$ ( "#add" ) . click ( function ( ) {
var $first = $ ( "#first option:checked" ) ;
$first. each ( function ( ) {
$ ( "#second" ) . append ( $ ( this ) )
} )
} )
$ ( "#add_all" ) . click ( function ( ) {
var $children = $ ( "#first" ) . children ( )
$children. each ( function ( ) {
$ ( "#second" ) . append ( $ ( this ) )
} )
} )
$ ( "#remove" ) . click ( function ( ) {
var $second = $ ( "#second option:checked" ) ;
$second. each ( function ( ) {
$ ( "#first" ) . append ( $ ( this ) )
} )
} )
$ ( "#remove_all" ) . click ( function ( ) {
var $children = $ ( "#second" ) . children ( ) ;
$children. each ( function ( ) {
$ ( "#first" ) . append ( $ ( this ) )
} )
} )
} )
</ script>
</ head>
< body>
< div style = " border : 1px dashed #E6E6E6; margin : 50px 0px 0px 50px; width : 350px; height : 260px; background-color : #E6E6E6; " >
< table width = " 285" height = " 169" border = " 0" align = " left" cellpadding = " 0" cellspacing = " 0"
style = " margin : 15px 0px 0px 15px; " >
< tr>
< td width = " 126" >
< select name = " first" size = " 10" multiple = " multiple" class = " td3" id = " first" >
< option value = " 选项1" > 选项1</ option>
< option value = " 选项2" > 选项2</ option>
< option value = " 选项3" > 选项3</ option>
< option value = " 选项4" > 选项4</ option>
< option value = " 选项5" > 选项5</ option>
< option value = " 选项6" > 选项6</ option>
< option value = " 选项7" > 选项7</ option>
< option value = " 选项8" > 选项8</ option>
</ select>
</ td>
< td width = " 69" valign = " middle" >
< input name = " add" id = " add" type = " button" class = " button" value = " -->" />
< input name = " add_all" id = " add_all" type = " button" class = " button" value = " ==>" />
< input name = " remove" id = " remove" type = " button" class = " button" value = " < --" />
< input name = " remove_all" id = " remove_all" type = " button" class = " button" value = " < ==" />
</ td>
< td width = " 127" align = " left" >
< select name = " second" size = " 10" multiple = " multiple" class = " td3" id = " second" >
< option value = " 选项9" > 选项9</ option>
</ select>
</ td>
</ tr>
</ table>
</ div>
</ body>
</ html>
8.页面加载完毕触发方式
9.作业
1.作业一
<! DOCTYPE html >
< html lang = " en" >
< head>
< meta charset = " UTF-8" >
< title> Title</ title>
< script type = " text/javascript" src = " ../script/jquery-3.6.0.min.js" > </ script>
< script>
$ ( function ( ) {
$ ( "button" ) . click ( function ( ) {
var $input = $ ( "input[name='sport']:checked" ) ;
var res = "您选中的信息是:" ;
if ( $input) {
$input. each ( function ( ) {
res += $ ( this ) . val ( ) ;
} )
res += ",个数是:" + $input. length;
alert ( res)
}
} )
} )
</ script>
</ head>
< body>
< input type = " checkbox" name = " sport" value = " 篮球" > 篮球< br>
< input type = " checkbox" name = " sport" value = " 排球" > 排球< br>
< input type = " checkbox" name = " sport" value = " 羽毛球" > 羽毛球< br>
< input type = " checkbox" name = " sport" value = " 乒乓球" > 乒乓球< br>
< button> 选中的个数</ button>
</ body>
</ html>
2.作业二
<! DOCTYPE html >
< html lang = " en" >
< head>
< meta charset = " UTF-8" >
< title> Title</ title>
< script type = " text/javascript" src = " ../script/jquery-3.6.0.min.js" > </ script>
< script>
$ ( function ( ) {
$ ( "button" ) . eq ( 0 ) . click ( function ( ) {
$ ( "select[name='sel1'] option[value='se2']" ) . attr ( "selected" , true ) ;
} )
$ ( "button" ) . eq ( 1 ) . click ( function ( ) {
$ ( "select[name='sel2'] option" ) . eq ( 1 ) . attr ( "selected" , true )
$ ( "select[name='sel2'] option" ) . eq ( 4 ) . attr ( "selected" , true )
} )
$ ( "button" ) . eq ( 2 ) . click ( function ( ) {
$ ( ":checkbox:odd" ) . attr ( "checked" , true )
} )
$ ( "button" ) . eq ( 3 ) . click ( function ( ) {
$ ( ":radio:eq(1)" ) . attr ( "checked" , true )
} )
$ ( "button" ) . eq ( 4 ) . click ( function ( ) {
var $selected = $ ( ":selected" ) ;
$selected. each ( function ( ) {
console. log ( $ ( this ) . text ( ) )
} )
var $checked = $ ( "input:checked" ) ;
$checked. each ( function ( ) {
console. log ( $ ( this ) . val ( ) )
} )
} )
} )
</ script>
</ head>
< body>
< button> 使单选下拉框的2号被选中</ button>
< br>
< button> 使多选下拉框的2号和5号被选中</ button>
< br>
< button> 使复选框的复选2和复选4被选中</ button>
< br>
< button> 使单选框的单选2被选中</ button>
< br>
< button> 打印已经选中的值</ button>
< br> < br>
< select name = " sel1" >
< option value = " se1" > 1号</ option>
< option value = " se2" > 2号</ option>
< option value = " se3" > 3号</ option>
< option value = " se4" > 4号</ option>
< option value = " se5" > 5号</ option>
</ select> < br> < br>
< select name = " sel2" multiple = " multiple" style = " height : 100px" >
< option value = " sem1" > 1号</ option>
< option value = " sem2" > 2号</ option>
< option value = " sem3" > 3号</ option>
< option value = " sem4" > 4号</ option>
< option value = " sem5" > 5号</ option>
</ select> < br> < br>
< input type = " checkbox" value = " 复选1" name = " ch" > 复选1
< input type = " checkbox" value = " 复选2" name = " ch" > 复选2
< input type = " checkbox" value = " 复选3" name = " ch" > 复选3
< input type = " checkbox" value = " 复选4" name = " ch" > 复选4< br> < br>
< input type = " radio" name = " ra" value = " 单选1" > 单选1
< input type = " radio" name = " ra" value = " 单选2" > 单选2
< input type = " radio" name = " ra" value = " 单选3" > 单选3
</ body>
</ html>
3.作业三(处理布尔属性使用prop)
<! DOCTYPE html >
< html lang = " en" >
< head>
< meta charset = " UTF-8" >
< title> Title</ title>
< script type = " text/javascript" src = " ../script/jquery-3.6.0.min.js" > </ script>
< script>
$ ( function ( ) {
$ ( "button:eq(0)" ) . click ( function ( ) {
$ ( "input" ) . prop ( "checked" , true )
} )
$ ( "button:eq(1)" ) . click ( function ( ) {
$ ( "input" ) . prop ( "checked" , false )
} )
$ ( "button:eq(2)" ) . click ( function ( ) {
$ ( "input" ) . each ( function ( ) {
if ( $ ( this ) . prop ( "checked" ) ) {
$ ( this ) . prop ( "checked" , false )
}
else {
$ ( this ) . prop ( "checked" , true )
}
} )
} )
} )
</ script>
</ head>
< body>
< h4> 请选择您的爱好</ h4>
< input type = " checkbox" name = " ch" value = " ch1" > 足球
< input type = " checkbox" name = " ch" value = " ch2" > 篮球
< input type = " checkbox" name = " ch" value = " ch3" > 游泳
< input type = " checkbox" name = " ch" value = " ch4" > 唱歌< br>
< button> 全选</ button>
< button> 全不选</ button>
< button> 反选</ button>
</ body>
</ html>
4.作业四
<! DOCTYPE html >
< html lang = " en" >
< head>
< meta charset = " UTF-8" >
< title> Title</ title>
< script type = " text/javascript" src = " ../script/jquery-3.6.0.min.js" > </ script>
< script>
$ ( function ( ) {
$ ( "input[type='submit']" ) . click ( function ( ) {
var name = $ ( "input:eq(0)" ) . val ( ) ;
var email = $ ( "input:eq(1)" ) . val ( ) ;
var num = $ ( "input:eq(2)" ) . val ( ) ;
var $tr = $ ( "<tr><td>" + name + "</td><td>" + email + "</td><td>" + num + "</td><td><a href='#'>delete</a></td></tr>" ) ;
$ ( "table" ) . append ( $tr) ;
} )
$ ( "table" ) . on ( "click" , "a" , function ( ) {
var $name = $ ( this ) . closest ( "tr" ) . find ( "td:first" ) . text ( ) ;
var isConfirmed = confirm ( "是否要删除名字为 " + $name + " 的行?" ) ;
if ( isConfirmed) {
$ ( this ) . closest ( "tr" ) . remove ( ) ;
}
} ) ;
} )
</ script>
</ head>
< body>
< h4> 用户前台管理系统</ h4>
姓名:< input type = " text" >
email:< input type = " text" >
电话:< input type = " text" >
< input type = " submit" value = " 提交" >
< hr>
< table width = " 700" border = " 2px" style = " background : #b3d4fc; " >
< tr>
< th> 姓名</ th>
< th> email</ th>
< th> 电话</ th>
< th> 删除操作</ th>
</ tr>
</ table>
</ body>
</ html>
1.添加
2.删除