同源(访问的网站域名与服务器域名一致)才能用方法一下载
方法一: 同源资源文件下载
const downLoadFunc = (imgSrc, imgName) => {
if (!imgSrc) return
let url = window.URL.createObjectURL(new Blob([imgSrc]))
let link = document.createElement('a')
link.style.display = 'none'
link.href = url
link.setAttribute('download', imgName)
document.body.appendChild(link)
link.click()
}
方法二: 跨域资源图片下载
const downLoadFunc = (imgSrc, imgName) => {
if (!imgSrc) return
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 link = document.createElement('a')
let event = new MouseEvent('click')
link.download = imgName || (new Date().getTime())
link.href = url
link.dispatchEvent(event)
}
image.src = imgSrc
}
方法三: 跨域资源pdf下载
const downLoadFunc = (imgSrc, imgName) => {
if (!imgSrc) return
fetch(imgSrc).then(function (response) {
response.arrayBuffer().then(res => {
let type = 'application/pdf;charset-UTF-8' // 资源类型pdf
// 常见资源类型
// 1.excel: type = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
// 2.图片: type = "image/*"
// 3.视频: type = "video/*"
// 4.音频: type = "audio/*"
// 5.pdf: type = "application/pdf;charset-UTF-8"
//
let blob = new Blob([res], {type: type})
let objectUrl = URL.createObjectURL(blob)
let link = document.createElement('a')
link.style.display = 'none'
link.href = objectUrl
link.setAttribute('download', imgName)
document.body.appendChild(link)
link.click()
document.body.removeChild(link)
})
})
}
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