vue下载附件按钮功能

一.tools文件夹下tools文件中封装下载方法:

function iframeEle(imgsrc, fileName) {
    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 = fileName || '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
    return Promise.resolve()

}

exports.download = (url, fileName, failCallbacck) => {
    try {
        iframeEle(url, fileName)
    } catch (e) {
        failCallbacck && failCallbacck(e)
    }
}

二.导入方法:

三.使用方法:

handleDownload() {
      // 员工表模板下载
      let url = `${config.api_v1}company/staff/template/url?token=${this.$user.token}`;
      download(url,"photo");
    },