vue点击按钮实现保存图片下载图片

缺点:

如果在微信内的话,会显示需跳转到浏览器下载.

解决方案:

微信的话有现成的接口developers.weixin.qq.com/miniprogram…

代码内容:

const saveImage = (imgsrc,imgname) => {
  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 = imgname || "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;

};