借助以下php
函数:
<?php
if (!function_exists('wrapAds')) {
function wrapAds($current_banner_name){
$STRING_EMPTY = "";
$openExprResult = array();
$closeExpreResult = array();
$openExpr = "/(<div[^>]*>)/";
$closeExpr = "/(<\/div>)/";
$banner = tsp_get_banner($current_banner_name);
$result = '<pre data-script-reference>'
.htmlspecialchars($banner)
.'</pre>';
return $result;
}
}
?>
我正在渲染以下标记
:
<pre data-script-reference="1"><!--- s: middle-box-sidebar -->
<div class="ads middle-box-sidebar"><script type="text/javascript">
var FW_type = "4w";
var FW_code = "18xxxx;95xxx;70xxx;0";
var FW_dimension = "300x250";
var FW_category = "gossip";
</script>
<script src="//optimized-by.4wnetwork.com/simply_loader.js?4wvideo=true" type="text/javascript"></script></div>
<!--- e: middle-box-sidebar --></pre>
现在我尝试使用以下脚本推迟编码脚本的执行:
<script type="text/javascript">
[].slice.call(document.querySelectorAll('pre[data-script-reference]'))
.forEach(function(item){
var txt = document.createElement("textarea");
txt.innerHTML = item.innerHTML;
var parentNode = item.parentNode;
var p0 = txt.innerText;
// parentNode.removeChild(item);
parentNode.innerHTML += p0;
</script>
似乎解码的脚本根本没有执行,我做错了什么?
最佳答案
在执行了一万亿次无用的代码之后,我刚刚在一长串警告中注意到了一个奇怪的语句:
“无法对“文档”执行“写入”:除非显式打开,否则无法从异步加载的外部脚本写入文档。”。我用谷歌搜索了这条消息,发现了 nice question .
唯一未接受的答案建议postscribe.js
Asynchronously write javascript, even with document.write.
Remote scripts, especially ads, block the page from doing anything else while they load. They contribute a large % to load times which affects your bottom line. Asynchronous ads do not block the page and can be delivered after core content - Async FTW.Why is it so hard to deliver ads asynchronously? Because they may contain calls to document.write, which expects to be handled synchronously. PostScribe lets you deliver a synchronous ad asynchronously without modifying the ad code.
因此,由于我必须管理正文和侧边栏中的广告,因此我进行了一些重构,将 php 函数移至函数中.php:
/**
* redefine and get the legacy ads block from base library by name
* render as encoded plain text inside a *pre* wrapper
*/
function tsp_get_banner($current_banner_name){
$STRING_EMPTY = "";
// https://stackoverflow.com/questions/1732348/regex-match-open-tags-except-xhtml-self-contained-tags
$openExpr = "/(<div[^>]*>)/";
$closeExpr = "/(<\/div>)/";
$openExprResult = $closeExpreResult = array();
$banner = original_tsp_get_banner($current_banner_name);
preg_match($openExpr, $banner, $openExprResult);
$banner = preg_replace($openExpr, $STRING_EMPTY, $banner);
preg_match($closeExpr, $banner, $closeExpreResult);
$banner = preg_replace($closeExpr, $STRING_EMPTY, $banner);
return wrapAdsSnippet($banner, $openExprResult[0], $closeExpreResult[0]);
}
function wrapAdsSnippet($source, $prefix, $postfix){
$result = '<pre data-script-reference style="display:none;">'
.htmlspecialchars($source)
.'</pre>';
if(isset($prefix) && isset($postfix)){
$result = $prefix.$result.$postfix;
}
return $result;
}
然后我更改了 block 的包含:
这样我就不需要改变任何东西。
<?php
echo tsp_get_banner("中间框侧边栏");
echo renderAds("middle-box-sidebar");
?>
我只需更改最终脚本以包含在 footer.php 中:
var MyCompanyLab;
(function (MyCompanyLab) {
"use strict";
var Ads;
(function (Ads) {
var Optimization;
(function (Optimization) {
var PostProcessor = (function () {
function PostProcessor() {
}
PostProcessor.postponeAdsExecution = function () {
$("pre[data-script-reference]").each(function (idx, item) {
var parentNode = item.parentNode;
postscribe(parentNode, $('<textarea />').html(item.innerHTML).text(), {
done: function () { },
error: function () { },
releaseAsync: true,
});
parentNode.removeChild(item);
});
};
return PostProcessor;
}());
Optimization.PostProcessor = PostProcessor;
})(Optimization = Ads.Optimization || (Ads.Optimization = {}));
})(Ads = MyCompanyLab.Ads || (MyCompanyLab.Ads = {}));
})(MyCompanyLab|| (MyCompanyLab= {}));
<script type="text/javascript">
...
MyCompanyLab.Ads.Optimization.PostProcessor.postponeAdsExecution();
...
</script>
关于javascript - 推迟广告脚本执行,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/41892394/