VUE project saves photos locally (WeChat environment is not feasible)

Note: The reason why the WeChat environment is not feasible is that the WeChat browser disables this downloaded script operation.

 <van-button type="info" @click="saveImg">保存到相册</van-button>
saveImg: function () {
    
    
   this.downloadIamge(this.bigPoster, "poster");
},
downloadIamge: function (imgsrc, name) {
    
     
  // imgsrc：图片地址，name：图片名称
 	let image = new Image();
  	image.setAttribute("crossOrigin", "anonymous");
  	image.onload = function () {
    
    
  	let canvas = document.createElement("canvas");
 	canvas.width = image.width;
  	canvas.height = image.height;
 	let context = canvas.getContext("2d");
  	context.drawImage(image, 0, 0, image.width, image.height);
  	let url = canvas.toDataURL("image/png"); //得到图片的base64编码数据
  	let a = document.createElement("a"); // 生成一个a元素
  	let event = new MouseEvent("click"); // 创建一个单击事件
  	a.download = name || "海报"; // 设置图片名称没有设置则为默认
  	a.href = url; // 将生成的URL设置为a.href属性
  	a.dispatchEvent(event); // 触发a的单击事件
  };
   image.src = imgsrc;
 },