vue 根据url下载图片方法

downloadByBlob(url,name) {


    let image = new Image()
    image.setAttribute('crossOrigin', 'anonymous')
    image.src = url
    image.onload = () => {
      let canvas = document.createElement('canvas')
      canvas.width = image.width
      canvas.height = image.height
      let ctx = canvas.getContext('2d')
      ctx.drawImage(image, 0, 0, image.width, image.height)
      canvas.toBlob((blob) => {
        let url = URL.createObjectURL(blob)
        download(url,name)
        // 用完释放URL对象
        URL.revokeObjectURL(url)
      })
    }
function download(href, name) {
  let eleLink = document.createElement('a')
  eleLink.download = name
  eleLink.href = href
  eleLink.click()
  eleLink.remove()
}
},

这个方法，可以直接拿去用，直接把你的图片url传给这个方法，就可以实现vue.js来下载图片了。