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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>输入框输入提示代码</title>
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<input name="keyword" type="text" value="请输入关键字" onFocus="this.value=‘‘" onBlur="if(!value){value=defaultValue;}">
<input type="text" class="text-130" value="请输入姓名" onmouseover="this.focus()" onblur="if (this.value ==‘‘) this.value=‘请输入姓名‘" onfocus="this.select()" onclick="if (this.value==‘请输入姓名‘) this.value=‘‘">
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原文：http://www.cnblogs.com/hellman/p/4078601.html