ajax上传图片获取进度

Question

用的ajax上传图片，怎么获取真实的上传进度。

Answer 1

  $.ajax({        url:'url',        data:formData,        type: 'POST',        cache: false,        contentType: false,        processData: false,        success:function(data){
            
        },        xhr:function(){ //获取上传进度
            var myXhr = $.ajaxSettings.xhr(); 
               if(myXhr.upload){ // check if upload property exists 
                   myXhr.upload.addEventListener('progress',function(e){ 
                       var loaded = e.loaded;//已经上传大小情况
                    var tot = e.total;//附件总大小
                    var per = Math.floor(100*loaded/tot);  //已经上传的百分比
                    console.log(per)
                }, false); 
            }  
              return myXhr;  
          }
    })