获取图片上传前的宽高

var reader = new FileReader();var that = this;reader.onload = function(e){//console.log(e); ???var img = new Image(); ???img.src = e.target.result; ???img.onload = function(){
 ???????console.log(this.width, " ", this.height); ???????if(this.width != 500 || this.height != 158){ ???????　　that.$message.error(‘图片宽高不符合尺寸！！‘); ???????　　that.$refs.upload.abort(); ???????　　that.$refs.upload.clearFiles(); ???　　} ???}}var url = reader.readAsDataURL(file);