前端实现访问img地址直接下载

    handleDownload(row) {
      const { id, pictureurllist } = row
      if (pictureurllist && pictureurllist[0]) {
        const { fileservicepath, filesuffix, title } = pictureurllist[0]
        const isImg = ['jpg', 'jpeg', 'png'].includes(filesuffix)
        console.log(isImg)
        if (isImg) {
          this.downloadIamge(fileservicepath, title)
        } else {
          window.open(fileservicepath)
        }
      }
    },
    downloadIamge(imgsrc, name) {
      let image = new Image()
      // 解决跨域 Canvas 污染问题
      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 || 'photo' // 设置图片名称
        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
    }