页面加载JS事件

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window.onload = function showDate() {
var now = new Date();
var year = now.getFullYear();
var month = (now.getMonth() + 1 > 9) ? now.getMonth() + 1 : "0" + (now.getMonth() + 1);//当月
var date = (now.getDate() > 9) ? now.getDate() : "0" + now.getDate();
var lastmonth = (now.getMonth() > 9) ? now.getMonth() : "0" + now.getMonth();//上个月
//var lastmonthdate = (now.getDate() - 30 > 9) ? now.getDate() - 30 : "0" + now.getDate() - 30;//今天 -30
if (document.getElementById("ID") != null) {
document.getElementById("ID").value = year + "-" + lastmonth + "-" + date;
}
if (document.getElementById("ID") != null) {
document.getElementById("ID").value = year + "-" + month + "-" + date;
}
}

页面加载JS事件

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原文地址：http://www.cnblogs.com/ss196/p/5509530.html