<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>文本框内显示提示文本 - www.jb200.com</title>
<script src="jquery.js" type="text/
javascript"></script>
<script type="text/javascript">
function inputTipText(){
$("input[class*=grayTips]") //所有样式名中含有grayTips的input
.each(function(){
var oldVal=$(this).val();//默认的提示性文本
$(this)
.css({"color":"#888"}) //灰色
.focus(function(){
if($(this).val()!=oldVal){$(this).css({"color":"#000"})}else{$(this).val("").css({"color":"#888"})}
})
.blur(function(){
if($(this).val()==""){$(this).val(oldVal).css({"color":"#888"})}
})
.keydown(function(){$(this).css({"color":"#000"})})
})
}
$(function(){
inputTipText(); //直接调用
})
</script>
</head>
<body>
<input type="text" value="输入您的用户名" class="grayTips" />
<input type="text" value="输入您的登录密码" class="aaagrayTips"/>
</body>
</html>
function addLoadEvent(func){
var oldonload = window.onload;
if (typeof window.onload != 'function'){
window.onload = func;
}else{
window.onload = function(){
oldonload();
func();
}
}
}
function checkText(){
var textId = document.getElementById('test');
var textDefault = '请输入字符';
function cls(){
if (this.value == textDefault){
this.value = '';
}
}
function res(){
if (this.value == ''){
this.value = textDefault;
}
}
textId.onfocus = cls;
textId.onblur = res;
}
addLoadEvent (checkText);
内容：<input id="test" type="text" value="请输入字符" />
