Javascript下载图片链接到本地

   // imageSrc 下载图片的链接
　　// name 图片的名称 
　　downloadImage (imageSrc, name) {
      let image = new Image()
　　　　// 告知请求的服务器 进行跨域请求
      image.setAttribute('crossOrigin', 'anonymous')
      image.src = imageSrc
      image.onload = function () {
        let canvas = document.createElement('canvas')
        canvas.width = image.width
        canvas.height = image.height
        console.log('canvas', canvas)
        let context = canvas.getContext('2d')
        context.drawImage(image, 0, 0, image.width, image.height)
        let url = canvas.toDataURL('image/png')
        let a = document.createElement('a')
        a.href = url
　　     a.download = name || 'photo'
        a.click()
      }
    }