![js中有["1","2","3","4"]这样一个string，怎么把它变成array](/aiimages/js%E4%B8%AD%E6%9C%89%5B%26quot%3B1%26quot%3B%2C%26quot%3B2%26quot%3B%2C%26quot%3B3%26quot%3B%2C%26quot%3B4%26quot%3B%5D%E8%BF%99%E6%A0%B7%E4%B8%80%E4%B8%AAstring%EF%BC%8C%E6%80%8E%E4%B9%88%E6%8A%8A%E5%AE%83%E5%8F%98%E6%88%90array.png)
check()
{
var
d
=
new
Date()
//取当前年月日，舍去时分秒
d
=
new
Date(d.getFullYear()
+
"-"
+
(d.getMonth()
+
1)
+
"-"
+
d.getDate())
var
d2
=
new
Date(document.
getElementById
("txtDate").value)
if
(d2
==
"Invalid
Date")
{
alert("非日期")
return
}
//getTime
从1970.1.1开始的毫秒数
var
n
=
d.getTime()
-
d2.getTime()
if
(n
==
0)
{
alert("相等")
}
else
if
(n
>
0)
{
alert("小于当前日期")
}
else
{
alert("大于当前日期")
}
}
