需求：想设置Imput标签Date默认值为当前时间，通过JavaScript实现。
示例：
<html>
......
<body>
<input type="date" id="date_info" placeholder="请输入时间"/>
......
<script>
$(document).ready(function () {
var time = new Date();
var day = ("0" + time.getDate()).slice(-2);
var month = ("0" + (time.getMonth() + 1)).slice(-2);
var today = time.getFullYear() + "-" + (month) + "-" + (day);
$('#date_info').val(today);
})
</script>
</body>
</html>