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function check_search(){var str=document.era_search_form.word;if(str.value.replace(/^\s+|\s+$/g,"")==""||str.value.replace(/^\s+|\s+$/g,"")=="请输入您要查询的关键词"){document.era_search_form.word.value="";alert("搜索关键词不能为空");str.focus();return false;}}

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