用JAVASCRIPT怎么取附件的后缀？？
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1<input onchange='a=value;alert(a.substr(a.lastIndexOf(".")+1,a.length))' type="file"/>
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s=a.substr(a.lastIndexOf(".")+1,a.length)
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1<input onchange='alert(value.replace(/.+\\./,""))' type="file"/>