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<input name="searchkey" type="text" size="20" value="请输入关键字" onFocus="this.value=‘‘">
<input onblur="if(this.value==‘‘)this.value=‘请输入关键字‘" class="input_01" onfocus="if(this.value==‘请输入关键字‘)this.value=‘‘" value="请输入关键字" type=text>
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原文地址:http://www.cnblogs.com/robt/p/4587344.html