<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<input type="file" value="" name="file" id="input" οnchange="upFile()">
<span id="span">上传格式只能为jpg、png格式</span>
</body>
<script>
function upFile(){
var inp=document.getElementById("input").value;
var s=inp.lastIndexOf(".");
var type= inp.substr(s,inp.length).toLowerCase();
alert(type);
if(type==".jpg"||type==".png"){
document.getElementById("span").innerHTML="格式正确";
}else{
document.getElementById("span").innerHTML="格式不正确";
}
}
</script>
</html>
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