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<input type="text" class="fl plsearch_txt" id="key" value="请输入关键字" onfocus="javascript:if(this.value==‘请输入关键字‘) this.value=‘‘;" onblur="javascript:if(this.value==‘‘) this.value=‘请输入关键字‘;">
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原文地址:http://www.cnblogs.com/hwaggLee/p/4547478.html