调用download.js下载
在页面目录下新建download.js文件，使用的时候引入。
download.js
(function (root, factory) {
if (typeof define === 'function' && define.amd) {
// AMD. Register as an anonymous module.
define([], factory);
} else if (typeof exports === 'object') {
// Node. Does not work with strict CommonJS, but
// only CommonJS-like environments that support module.exports,
// like Node.
module.exports = factory();
} else {
// Browser globals (root is window)
root.download = factory();
}
}(this, function () {
return function download(data, strFileName, strMimeType) {
var self = window, // this script is only for browsers anyway...
defaultMime = "application/octet-stream", // this default mime also triggers iframe downloads
mimeType = strMimeType || defaultMime,
payload = data,
url = !strFileName && !strMimeType && payload,
anchor = document.createElement("a"),
toString = function(a){
return String(a);},
myBlob = (self.Blob || self.MozBlob || self.WebKitBlob || toString),
fileName = strFileName || "download",
blob,
reader;
myBlob= myBlob.call ? myBlob.bind(self) : Blob ;
if(String(this)==="true"){
//reverse arguments, allowing download.bind(true, "text/xml", "export.xml") to act as a callback
payload=[payload, mimeType];
mimeType=payload[0];
payload=payload[1];
}
if(url && url.length< 2048){
// if no filename and no mime, assume a url was passed as the only argument
fileName = url.split("/").pop().split("?")[0];
anchor.href = url; // assign href prop to temp anchor
if(anchor.href.indexOf(url) !== -1){
// if the browser determines that it's a potentially valid url path:
var ajax=new XMLHttpRequest();
ajax.open( "GET", url, true);
ajax.responseType = 'blob';
ajax.onload= function(e){
download(e.target.response, fileName, defaultMime);
};
setTimeout(function(){
ajax.send();}, 0); // allows setting custom ajax headers using the return:
return ajax;
} // end if valid url?
} // end if url?
//go ahead and download dataURLs right away
if(/^data\:[\w+\-]+\/[\w+\-]+[,;]/.test(payload)){
if(payload.length > (1024*1024*1.999) && myBlob !== toString ){
payload=dataUrlToBlob(payload);
mimeType=payload.type || defaultMime;
}else{
return navigator.msSaveBlob ? // IE10 can't do a[download], only Blobs:
navigator.msSaveBlob(dataUrlToBlob(payload), fileName) :
saver(payload) ; // everyone else can save dataURLs un-processed
}
}//end if dataURL passed?
blob = payload instanceof myBlob ?
payload :
new myBlob([payload], {
type: mimeType}) ;
function dataUrlToBlob(strUrl) {
var parts= strUrl.split(/[:;,]/),
type= parts[1],
decoder= parts[2] == "base64" ? atob : decodeURIComponent,
binData= decoder( parts.pop() ),
mx= binData.length,
i= 0,
uiArr= new Uint8Array(mx);
for(i;i<mx;++i) uiArr[i]= binData.charCodeAt(i);
return new myBlob([uiArr], {
type: type});
}
function saver(url, winMode){
if ('download' in anchor) {
//html5 A[download]
anchor.href = url;
anchor.setAttribute("download", fileName);
anchor.className = "download-js-link";
anchor.innerHTML = "downloading...";
anchor.style.display = "none";
document.body.appendChild(anchor);
setTimeout(function() {
anchor.click();
document.body.removeChild(anchor);
if(winMode===true){
setTimeout(function(){
self.URL.revokeObjectURL(anchor.href);}, 250 );}
}, 66);
return true;
}
// handle non-a[download] safari as best we can:
if(/(Version)\/(\d+)\.(\d+)(?:\.(\d+))?.*Safari\//.test(navigator.userAgent)) {
url=url.replace(/^data:([\w\/\-\+]+)/, defaultMime);
if(!window.open(url)){
// popup blocked, offer direct download:
if(confirm("Displaying New Document\n\nUse Save As... to download, then click back to return to this page.")){
location.href=url; }
}
return true;
}
//do iframe dataURL download (old ch+FF):
var f = document.createElement("iframe");
document.body.appendChild(f);
if(!winMode){
// force a mime that will download:
url="data:"+url.replace(/^data:([\w\/\-\+]+)/, defaultMime);
}
f.src=url;
setTimeout(function(){
document.body.removeChild(f); }, 333);
}//end saver
if (navigator.msSaveBlob) {
// IE10+ : (has Blob, but not a[download] or URL)
return navigator.msSaveBlob(blob, fileName);
}
if(self.URL){
// simple fast and modern way using Blob and URL:
saver(self.URL.createObjectURL(blob), true);
}else{
// handle non-Blob()+non-URL browsers:
if(typeof blob === "string" || blob.constructor===toString ){
try{
return saver( "data:" + mimeType + ";base64," + self.btoa(blob) );
}catch(y){
return saver( "data:" + mimeType + "," + encodeURIComponent(blob) );
}
}
// Blob but not URL support:
reader=new FileReader();
reader.onload=function(e){
saver(this.result);
};
reader.readAsDataURL(blob);
}
return true;
}; /* end download() */
}));
项目完整代码
<template>
<view class="content">
<image class="bg-set" src="/static/bj.png" :style=" {height:windowHeight +'px'} "> </image>
<image class="btn-set" src="/static/xz.png" @click="clickDownLoad"> </image>
<view class="videoPoster" v-if="showVideo">
<video
src="https://vkceyugu.cdn.bspapp.com/VKCEYUGU-a450e3eb-029c-4568-83af-cd4160c8852e/c14e12c5-5542-4031-a414-6e70094b8829.mp4"
autoplay="autoplay" >
</video>
</view>
</view>
</template>
<script>
export default {
data() {
return {
windowWidth: 0,
windowHeight: 0,
showVideo: true
}
},
onLoad() {
uni.getSystemInfo({
success: (res) => {
//console.log(res)
this.windowWidth = res.windowWidth
this.windowHeight = res.windowHeight
}
});
},
methods: {
clickDownLoad() {
console.log('下载');
// ***判断是否在微信内打开，如果是，提示用户在外部浏览器打开，否则运行下载代码***
var ua = navigator.userAgent.toLowerCase();
if (ua.match(/MicroMessenger/i) == "micromessenger") {
alert("请在右上角...点击【在浏览器打开】")
} else {
this.downLoad() //调用下载函数
this.showVideo = false
uni.showLoading({
title: "正在下载"
});
}
},
downLoad() {
//测试发现，在pc端正常下载; 在移动端 qq浏览器，safari浏览器不能下载
let that = this;
let url =' https://vkceyugu.cdn.bspapp.com/VKCEYUGU-a450e3eb-029c-4568-83af-cd4160c8852e/c14e12c5-5542-4031-a414-6e70094b8829.mp4 ';
//**调用download.js下载，下载速度相对快一些**
let downjs = require("./download.js"); //引用当前目录下的自定义函数
let x=new XMLHttpRequest();
x.open("GET", url, true);
x.responseType = 'blob';
x.onload=function(e) {
downjs(x.response, "9898.mp4", "video/mp4" )
uni.hideLoading()
that.showVideo = true
};
x.send();
//**不调用download.js下载**
// let xhr = new XMLHttpRequest();
// xhr.open('GET', url, true);
// xhr.responseType = 'blob'; // 返回类型blob
// xhr.onload = function() {
// if (xhr.readyState === 4 && xhr.status === 200) {
// let blob = this.response;
// // 转换一个blob链接
// let u = window.URL.createObjectURL(new Blob([blob]));
// let a = document.createElement('a');
// a.download = 'test.mp4'; //下载后保存的名称
// a.href = u;
// a.style.display = 'none';
// document.body.appendChild(a);
// a.click();
// a.remove();
// uni.hideLoading();
// that.showVideo = true;
// }
// };
// xhr.send()
}
}
}
</script>
<style>
.bg-set {
width: 100%;
}
.btn-set {
height: 87rpx;
width: 253rpx;
position: absolute;
z-index: 1000;
top: 10%;
left: 50%;
transform: translateX(-50%) translateY(-50%);
}
.videoPoster {
width: 79%;
height: 71%;
border-radius: 10rpx;
overflow: hidden;
background-color: #333333;
position: absolute;
z-index: 1000;
top: 54%;
left: 50%;
transform: translateX(-50%) translateY(-50%);
/* 水平垂直居中 要与上方的top,left配合使用*/
}
video {
width: 100%;
height: 100%;
}
</style>