1，属性设置

$(function () {
		//Date range picker with time picker
		$('#reservationtime-1').daterangepicker({
			timePicker: false,
			timePickerIncrement: 1,
			timePicker24Hour: true,
			autoApply: true,
			singleDatePicker: true,
			locale: {
				format: 'YYYY-MM-DD',
				daysOfWeek: ['日', '一', '二', '三', '四', '五', '六'],
				monthNames: ['一月', '二月', '三月', '四月', '五月', '六月', '七月', '八月', '九月', '十月', '十一月', '十二月'],
				applyLabel: '确定',
				cancelLabel: '返回',
				separator: ' - '
			}
		});
		//Date range picker with time picker
		$('#reservationtime-2').daterangepicker({
			timePicker: false,
			timePickerIncrement: 1,
			timePicker24Hour: true,
			autoApply: true,
			singleDatePicker: true,
			locale: {
				format: 'YYYY-MM-DD',
				daysOfWeek: ['日', '一', '二', '三', '四', '五', '六'],
				monthNames: ['一月', '二月', '三月', '四月', '五月', '六月', '七月', '八月', '九月', '十月', '十一月', '十二月'],
				applyLabel: '确定',
				cancelLabel: '返回',
				separator: ' - '
			}
		});
	});

2，设置日期为7天前

function GetDate()
	{
		var date = new Date();
		year = date.getFullYear().toString().padStart(4, '0');
		month = (date.getMonth() + 1).toString().padStart(2, '0');
		day = date.getDate().toString().padStart(2, '0');
		return year + '-' + month +'-' + day;
	}


function GetSumDate(index) {  
		var date = new Date(); //当前日期
		var newDate = new Date();
		newDate.setDate(date.getDate() + index);//官方文档上虽然说setDate参数是1-31,其实是可以设置负数的
		var time = newDate.getFullYear().toString().padStart(4, '0')+"-"+((newDate.getMonth() + 1).toString().padStart(2, '0'))+"-"+newDate.getDate().toString().padStart(2, '0');
		return time;
	} 



function SearchSeven()
	{
        //一定要用ID，用name改不了
		document.getElementById("reservationtime-1").value = GetSumDate(-7); 
		document.getElementById("reservationtime-2").value = GetDate();

	}