jQuery实现文件上传大小限制
上传是使用FormData对象来实现，利用files[0].size属性来获取文件的大小，进行上传限制。
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>test</title>
<script src="https://cdn.bootcss.com/jquery/3.1.1/jquery.js"></script>
</head>
<body>
<form id="uploadForm" enctype="multipart/form-data">
<input id="file" type="file" name="file"/>
<button id="upload" type="button">上传</button>
</form>
<script>
var maxSize = 1000;//文件上传大小限制
$(#upload).click(function(){
var size = document.getElementById(file).files[0].size;
var filesize = (size / 1024).toFixed(2);
if(filesize < maxSize){
$.ajax({
url: /upload,
type: POST,
cache: false,
data: new FormData($(#uploadForm)[0]),
processData: false,
contentType: false
}).done(function(res) {
alert(上传文件成功);
}).fail(function(res) {
alert(上传文件失败);
});
}else{
alert(上传文件不许大于 + maxSize + KB);
}
});
</script>
</body>
</html>
