如何将实时图像URL转换为Angular Blob？

Question

林在角7个工作，我的要求是我需要Width，Height和Size (in how much kb or mb)图像，并且还我试着将其转化成blob。

我尝试使用以下代码，但即时通讯未获得确切的输出：

var img_url = "http://snook.ca/files/mootools_83_snookca.png";


 var blob = new Blob([img_url]);

 let reader = new FileReader;

 reader.readAsDataURL(blob); // read file as data url
 reader.onload = () => { // when file has loaded
    console.log(reader.result)
    var img:any = new Image();
    img.src = reader.result;

    img.onload = () => {

      this.uploaded_image_width = img.width; //to get image width
      this.uploaded_image_height = img.height;  //to get image height           

      this.uploaded_image_url = reader.result; //to get blob image
      console.log(reader.result)          
    };          
  } 

当im安慰时，blob数据出错（console.log(reader.result)），并且内部img.onload函数未执行。

我提到了这个小提琴来实现这一目标：http : //jsfiddle.net/guest271314/9mg5sf7o/

Answer 1

you can try like this way. i hope it helps you out

var img = new Image();
img.onload = function(){
    alert( this.width+' '+ this.height );
};
img.src = "http://lorempixel.com/output/city-q-c-250-250-1.jpg";