js ajax上传文件

1. // js上传world
   var fileM=document.querySelector("#uploadFile");
   $("input[name=world]").change(function(){
       // console.log($("input[name=world]")[0].files);
       var formData = new FormData();
       // console.log($("#uploadFile")[0].files);
       var fileObj = fileM.files[0];
       formData.append('file',fileObj);
       // console.log(formData);
       $.ajax({
           url: "/admin/question/move_files.html",
           type: "POST",
           data: formData,
           dataType:"json",
           cache: false,
           contentType: false,
           processData: false,
           success: function(data) {
               console.log(data);
               if(data.status == 1){
                   $("input[name=world_info]").val(data.info);
               }
               layer.msg(data.msg,{time:1500});
           },
           error: function(data) {
               layer.msg("网络错误",{time:1500});
           }
   
       })
   })