fileupload实现控制大小进行图片上传

if ($(".img-upload").length > 0) {
$('.img-upload').fileupload({
type: 'POST',
url: "/app/uploadImage",
dataType: 'json',
acceptFileTypes: /(\.|\/)(gif|jpe?g|png)$/i,
disableImageResize: /Android(?!.*Chrome)|Opera/
.test(window.navigator && navigator.userAgent),
add:function(e,data){//控制图片大小
var goUpload=true;
var uploadFile=data.files[0];
if(uploadFile.size>512000){
goUpload=false;
$('.master-updefeat').css("visibility","visible")
}
if(goUpload==true){
$('.master-updefeat').css("visibility","hidden")
data.submit();
}
},
done: function(e, data) {
var imgdata = data.result;
if (imgdata.errcode == 0) {
$(".J-masternum").hide();
$(".J-masterimg").attr("src", imgdata.data.url);
}
},
change: function(e, data) {//图片上传时显示进度
$(".J-masternum").show();
},
progressall: function(e, data) {//进度
var progress = parseInt(data.loaded / data.total * 100, 10);
$(".J-masternum").text(progress + '%');
},
error: function(e, data) {
　　错误回调
},
});
}

下面为对应的HTML代码

<div class="clearx ">
<div class="master-addicon">
<img src="{{subaccount['avatar']}}" class="J-masterimg" />
</div>
<div class="master-addiconinfo">
<div class="master-iconnotice">图标尺寸不超过250*250，大小不超过500K</div>
<div class="clearx">
<a href="javascript:;" rel="external nofollow"  rel="external nofollow"  class="master-filebtn">上传图标<input type="file" name="files[]" class="img-upload" /></a>
<span class="master-num J-masternum">0%</span>
</div>
<div class="master-updefeat">图片上传失败，请<a href="javascript:;" rel="external nofollow"  rel="external nofollow"  class="J-uploads">重试<input type="file" name="files[]" class="img-upload" /></a></div>
</div>
</div>