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<head>
<script>
</script>
</head>
<body>
<input type="text" id="searchKey" name="searchKey" value="请输入标题" onclick="clearDefaultText(this,'请输入标题')"/>
</body>
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function clearDefaultText (el,message)
{
var obj = el;
if(typeof(el) == "string")
obj = document.getElementById(id);
if(obj.value == message)
obj.value = "";
}
obj.onblur = function()
if(obj.value == "")
obj.value = message;
输入 CSS 代码……