45 lines
1.2 KiB
JavaScript
45 lines
1.2 KiB
JavaScript
/*- coding = utf-8 -*-
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@Time : 2023/8/24 17:15
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@Author : 管茂良
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@File : webCdn.js
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@web : www.php-china.com
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@Software: WebStorm
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*/
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//cdn访问失败，重新获取最新cdn
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//需要替换的域名
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const domains = [
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"lib.baomitu.com",
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"cdn.bootcdn.net/ajax/libs",
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"www.staticfile.org",
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"cdn.baomitu.com",
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"cdn.bytedance.com",
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"www.jsdelivr.com",
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"unpkg.com",
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]
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//重试次数
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const maxRetry = 3;
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const retryInfo = {}
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window.addEventListener('error',(e)=>{
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//通过标签，判断是脚本爆出的错误
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const tag = e.target
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//什么时候触发脚本加载失败？
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if(tag.tagName === "SCRIPT" && !(e instanceof ErrorEvent)){
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let url = new URL(tag.src)
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if(!retryInfo[url.pathname]){
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retryInfo[url.pathname]={
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time:0,
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nextIndex:0,
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}
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}
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const info = retryInfo[url.pathname]
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if(maxRetry>=info.time){
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url.host = domains[info.nextIndex]
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//阻塞页面后续的加载
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document.write(`<script src="${url.toString()}">\<\/script>`)
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info.time++;
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info.nextIndex = (info.nextIndex+1)%domains.length
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}
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}
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},true)
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