简易日期输入辅助工具（键盘操作，自动校验）

/* 
*** http://www.hansir.cn *** 
*/ 
var date_help = function(inp, divide){ 
this.inp = document.getElementById(inp); 
this.divide = divide; 
this.format = 'YYYY'+divide+'MM'+divide+'DD'; 
//显示字符样式 
this.styleH='<span style="font-weight:bold; color:green">'; 
this.styleB='</span>'; 
this.load(); // 初始化 
} 
date_help.prototype={ 
load: function(){ 
// 创建一个用于显示提示的DIV并设置样式 
var div = document.createElement('div'); 
div.setAttribute('style', 'height:21px; line-height:21px;font-family:宋体; font-size:13px; letter-spacing:1px; text-align:center; background:#fffff6; color:#f60; border:1px solid #ccc; border-top:0; position:absolute; visibility:hidden'); 
div.style.cssText = 'height:21px; line-height:21px; font-family:宋体; font-size:13px; letter-spacing:1px; text-align:center; background:#fffff6; color:#f60; border:1px solid #ccc; border-top:0; position:absolute; visibility:hidden'; 
div.innerHTML = this.format; 
this.div = div; 
document.body.appendChild(div); 
// 设置DIV的位置 
var inp = this.inp; 
var inpW = inp.offsetWidth, inpH = inp.offsetHeight; 
var left = 0, top = 0; 
while(inp != null){ // 计算输入框在页面里的坐标给提示框使用 
left += inp.offsetLeft; 
top += inp.offsetTop; 
inp = inp.offsetParent; 
} 

this.div.style.height = '21px'; 
this.div.style.width = inpW-2 + 'px'; 
this.div.style.left = left + 'px'; 
this.div.style.top = inpH+top + 'px'; 
// 加载输入框事件 
var oThis = this; 
this.inp.onfocus = function(){ 
oThis.inp_v.call(oThis); 
} 
this.inp.onblur = function(){ 
oThis.inp_h.call(oThis); 
} 
this.inp.onkeypress = function(e){ //键盘按下事件 
e?intKey=e.which:intKey=event.keyCode; 
return oThis.inp_press.call(oThis, intKey); 
} 
this.inp.onkeyup = function(e){ 
e?intKey=e.which:intKey=event.keyCode; 
oThis.inp_chk.call(oThis,intKey); 
} 
}, 
inp_v: function(){ // 提示信息显示 
this.div.style.visibility = 'visible'; 
}, 
inp_h: function(){ // 提示信息显示 
if(new RegExp('^\\d+'+this.divide+'\\d'+this.divide).test(this.inp.value)){ // 月数补0 
this.inp.value = this.inp.value.replace(new RegExp('^(\\d+'+this.divide+')(\\d)(?='+this.divide+')'),'$10$2'); 
this.parseDate(); 
this.parseFormat(); 
}