JS实现日期输入格式提示功能_日期时间特效

用JS配合CSS实现的日期输入格式提示功能，当用户点击文本框准备输入的时候，自动出现日期格式的提示，以避免用户不知道输入什么样的日期格式而使程序出错，本代码段中一共有两种样式的时期提示，至于你想用哪一种你自己眩

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" mrc="text/html; charset=gb2312" />
<TITLE>日期输入提示</TITLE>
<script type="text/javascript">
var data_help = function(inp, format){
 this.inp = document.getElementById(inp);
 this.format = format;
 var div = document.createElement('div');
 div.setAttribute('style', 'color:#f33; text-indent:3px; position:absolute; visibility:hidden');
 div.style.cssText = 'color:#f33;border-top:0; text-indent:3px; position:absolute; visibility:hidden';
 div.innerHTML = this.format;
 this.div = div;
 document.body.appendChild(div);
 this.load();
 var oThis = this;
 this.inp.onfocus = function(){
  oThis.inp_v.call(oThis);
 }
 this.inp.onblur = function(){
  oThis.inp_h.call(oThis);
 }
 this.inp.onkeyup = function(){
  oThis.inp_chk.call(oThis);
 }
}
data_help.prototype={
load: function(){
 var inp = this.inp;
 var inpW = inp.offsetWidth, inpH = inp.offsetHeight;
 var left = 0, top = 0;
 while(inp != null){
  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';
},
inp_v: function(){
 this.div.style.visibility = 'visible';
},
inp_h: function(){
 this.div.style.visibility = 'hidden';
},
inp_chk: function(){
 var p = this.inp.value.replace(/\s/g,'');
 var w = this.format;
 var n=0;
 for(var i=0; i<p.length; i++){
  if(/[^a-zA-Z]/.test(w.charAt(i))){
   if(p.charAt(i)!=w.charAt(i)){
    break;
   }
  }
  n++;
 }
 this.div.innerHTML= '<span style="font-weight:bold; color:green">'+w.slice(0,n)+'</span>'+w.slice(n,w.length);
}
}
window.onload = function(){
 new data_help('birthday', 'yyyy/mm/dd');
 new data_help('birthday2', 'yyyy-mm-dd');
}
</script>
<style>
 fieldset{ width:300298px; padding:22px;}
</style>
</HEAD>
<body>
<div>
提示样式A：<input type="text" id="birthday" /><br/><br />
提示样式B：<input type="text" id="birthday2" />
</div>
</body>
</html>

所属频道：日期时间特效/更新时间：2012-12-14

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