前端学习——jsDay5

对象

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对象使用

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小练习

<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
       let obj = {
        name:'小米',
        num:'100012816024',
        weight:'0.55',
        address:'中国大陆'
       }
    </script>
</body>

</html>

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小练习

<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
       let obj = {
        name:'小米',
        num:'100012816024',
        weight:'0.55',
        address:'中国大陆'
       }
       obj.name='小米10 PLUS'
       obj.color='粉色'
       console.log(obj.name)
       console.log(obj.num)
       console.log(obj.weight)
       console.log(obj.address)
       console.log(obj.color)
    </script>
</body>

</html>

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遍历对象

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小练习
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<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        let students = [
            { name: '小明', age: 18, gender: '男', hometown: '河北省' },
            { name: '小红', age: 19, gender: '女', hometown: '河南省' },
            { name: '小刚', age: 17, gender: '男', hometown: '山西省' },
            { name: '小丽', age: 18, gender: '女', hometown: '山东省' }
        ]
        for(let k in students){
            console.log(students[k])
        }
    </script>
</body>

</html>

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        table {
            width: 600px;
            text-align: center;
        }

        table,
        th,
        td {
            border: 1px solid #ccc;
            border-collapse: collapse;
        }

        caption {
            font-size: 18px;
            margin-bottom: 10px;
            font-weight: 700;
        }

        tr {
            height: 40px;
            cursor: pointer;
        }

        table tr:nth-child(1) {
            background-color: #ddd;
        }

        table tr:not(:first-child):hover {
            background-color: #eee;
        }
    </style>
</head>

<body>
    <h2>学生信息</h2>
    <p>将数据渲染到页面中...</p>

    <table>
        <caption>学生列表</caption>
        <tr>
            <th>序号</th>
            <th>姓名</th>
            <th>年龄</th>
            <th>性别</th>
            <th>家乡</th>
        </tr>
        <script>
            let students = [
                { name: '小明', age: 18, gender: '男', hometown: '河北省' },
                { name: '小红', age: 19, gender: '女', hometown: '河南省' },
                { name: '小刚', age: 17, gender: '男', hometown: '山西省' },
                { name: '小丽', age: 18, gender: '女', hometown: '山东省' }
            ]
            for (let i = 0; i < students.length; i++) {
                document.write(`
                <tr>
            <td>${i+1}</td>
            <td>${students[i].name}</td>
            <td>${students[i].age}</td>
            <td>${students[i].gender}</td>
            <td>${students[i].hometown}</td>
        </tr>
                `)
            }
        </script>
    </table>

</body>

</html>

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内置对象

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内置对象math

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小练习

<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        let arr = ['赵云', '黄忠', '关羽', '张飞', '马超', '刘备', '曹操']
        let random = Math.floor(Math.random()*(arr.length))
        document.write(arr[random])
        arr.splice(random,1)   //splice(起始位置，删除个数)
        console.log(arr)
    </script>
</body>
</html>

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<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        function getRandom(N,M){
            return Math.floor(Math.random()*(M-N+1))+N
        }
        num = getRandom(1,10)
        while(true){
            let gus = prompt('请输入猜测数字：')
            if(gus<num)
                alert('小了')
            if(gus>num)
                alert('大了')
            if(gus==num){
                alert('对了')
                break
            }
        }
    </script>
</body>
</html>

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<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        function getRandom(N,M){
            return Math.floor(Math.random()*(M-N+1))+N
        }
        let arr = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f']
        function getRandomColor(flag) {
            if(flag==false){
                let num1=getRandom(0,255)
                let num2=getRandom(0,255)
                let num3=getRandom(0,255)
                return `rgb(${num1},${num2},${num3})`
            }
            else{
                let re = '' 
                for(let i=1;i<=6;i++){
                   let th = Math.floor(Math.random()*arr.length)
                   re=re + arr[th]
                }
                return `#${re}`
            }
        }
        console.log(getRandomColor(true)) //#ffffff
        console.log(getRandomColor(false)) //rgb(255,255,255)
    </script>
</body>

</html>

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综合案例

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>学车在线首页</title>
    <link rel="stylesheet" href="./js学习/JavaScript基础笔记和作业/JavaScript基础笔记和作业/JavaScript基础第五天/06-素材/综合作业素材/css/style.css">
    <style>

    </style>
</head>

<body>

    <!-- 4. box核心内容区域开始 -->
    <div class="box w">
        <div class="box-hd">
            <h3>精品推荐</h3>
            <a href="#">查看全部</a>
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        <div class="box-bd">
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                    for (let i = 0; i < data.length; i++) {
                        document.write(`
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                        <img src=${data[i].src}>
                        <h4>
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                        <div class="info">
                            <span>高级</span> • <span>${data[i].num}</span>人在学习
                        </div>
                    </a>
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