输入框类型为datetime-local动态获取当前时间

先看显示效果：

html代码：<input type="datetime-local" id="currentDate">
jQuery代码：

	$(function(){
    var today = new Date();//返回当前日期和时间
    var yyyy = today.getFullYear();//获取当前年份
    var MM = today.getMonth() + 1;//因为getMonth()方法获取的是索引值，获取的月份为0-11，所以要＋1
    var dd = today.getDate();//从 Date 对象返回一个月中的某一天 (1 ~ 31）
    var hh = today.getHours();//返回 Date 对象的小时 (0 ~ 23)
    var mm = today.getMinutes();//返回 Date 对象的分钟 (0 ~ 59)
    MM = checkTime(MM);//调用下面的checkTime函数，设置小于10的时间数字格式，例如5秒显示成05秒
    dd = checkTime(dd);
    hh = checkTime(hh);
    mm = checkTime(mm);
    var time = yyyy + "-" + MM + "-" + dd + "T" + hh + ":" + mm;
    var dateControl = document.querySelector("#availableFrom");
    dateControl.value = time;
    function checkTime(i) {
        if (i < 10) {
            i = "0" + i;//这里如果是一位数则在前面添加一位0
        }
        return i;`
     }）;

需注意：var time = yyyy + “-” + MM + “-” + dd + “T” + hh + “:” + mm；中的"T"是必须要加上的，此处T表示time元素的开始；

字符	含义
YYYY	is the decimal digits of the year 0000 to 9999 in the Gregorian calendar.
-	“-” (hyphen) appears literally twice in the string.
MM	is the month of the year from 01 (January) to 12 (December).
DD	is the day of the month from 01 to 31.
T	“T” appears literally in the string, to indicate the beginning of the time element.
HH	is the number of complete hours that have passed since midnight as two decimal digits from 00 to 24.
:	“:” (colon) appears literally twice in the string.
mm	is the number of complete minutes since the start of the hour as two decimal digits from 00 to 59.
ss	is the number of complete seconds since the start of the minute as two decimal digits from 00 to 59.
.	“.” (dot) appears literally in the string.
sss	is the number of complete milliseconds since the start of the second as three decimal digits.
Z	is the time zone offset specified as “Z” (for UTC) or either “+” or “-” followed by a time expression HH:mm