小编Swa*_*wap的帖子

页面源中的这个长脚本是什么。它是用来做什么的?

下面的脚本嵌入在<meta>标签正下方的 html 页面的 head 部分中。谁能解释一下将这么长的脚本放在没有内容的头部部分的目的是什么?

<script type="text/javascript">
    (window.NREUM||(NREUM={})).loader_config={xpid:"Vg8HU1dUGwIJVFZaBwk="};window.NREUM||(NREUM={}),__nr_require=function(t,e,n){function r(n){if(!e[n]){var o=e[n]={exports:{}};t[n][0].call(o.exports,function(e){var o=t[n][1][e];return r(o?o:e)},o,o.exports)}return e[n].exports}if("function"==typeof __nr_require)return __nr_require;for(var o=0;o<n.length;o++)r(n[o]);return r}({QJf3ax:[function(t,e){function n(t){function e(e,n,a){t&&t(e,n,a),a||(a={});for(var c=s(e),f=c.length,u=i(a,o,r),d=0;f>d;d++)c[d].apply(u,n);return u}function a(t,e){f[t]=s(t).concat(e)}function s(t){return f[t]||[]}function c(){return n(e)}var f={};return{on:a,emit:e,create:c,listeners:s,_events:f}}function r(){return{}}var o="nr@context",i=t("gos");e.exports=n()},{gos:"7eSDFh"}],ee:[function(t,e){e.exports=t("QJf3ax")},{}],3:[function(t){function e(t){try{i.console&&console.log(t)}catch(e){}}var n,r=t("ee"),o=t(1),i={};try{n=localStorage.getItem("__nr_flags").split(","),console&&"function"==typeof console.log&&(i.console=!0,-1!==n.indexOf("dev")&&(i.dev=!0),-1!==n.indexOf("nr_dev")&&(i.nrDev=!0))}catch(a){}i.nrDev&&r.on("internal-error",function(t){e(t.stack)}),i.dev&&r.on("fn-err",function(t,n,r){e(r.stack)}),i.dev&&(e("NR AGENT IN DEVELOPMENT MODE"),e("flags: "+o(i,function(t){return t}).join(", ")))},{1:23,ee:"QJf3ax"}],4:[function(t){function e(t,e,n,i,s){try{c?c-=1:r("err",[s||new UncaughtException(t,e,n)])}catch(f){try{r("ierr",[f,(new Date).getTime(),!0])}catch(u){}}return"function"==typeof a?a.apply(this,o(arguments)):!1}function UncaughtException(t,e,n){this.message=t||"Uncaught error with no additional information",this.sourceURL=e,this.line=n}function n(t){r("err",[t,(new Date).getTime()])}var r=t("handle"),o=t(6),i=t("ee"),a=window.onerror,s=!1,c=0;t("loader").features.err=!0,t(5),window.onerror=e;try{throw new Error}catch(f){"stack"in f&&(t(1),t(2),"addEventListener"in window&&t(3),window.XMLHttpRequest&&XMLHttpRequest.prototype&&XMLHttpRequest.prototype.addEventListener&&window.XMLHttpRequest&&XMLHttpRequest.prototype&&XMLHttpRequest.prototype.addEventListener&&!/CriOS/.test(navigator.userAgent)&&t(4),s=!0)}i.on("fn-start",function(){s&&(c+=1)}),i.on("fn-err",function(t,e,r){s&&(this.thrown=!0,n(r))}),i.on("fn-end",function(){s&&!this.thrown&&c>0&&(c-=1)}),i.on("internal-error",function(t){r("ierr",[t,(new Date).getTime(),!0])})},{1:10,2:9,3:7,4:11,5:3,6:24,ee:"QJf3ax",handle:"D5DuLP",loader:"G9z0Bl"}],5:[function(t){t("loader").features.ins=!0},{loader:"G9z0Bl"}],6:[function(t){function e(){}if(window.performance&&window.performance.timing&&window.performance.getEntriesByType){var n=t("ee"),r=t("handle"),o=t(1),i=t(2);t("loader").features.stn=!0,t(3),n.on("fn-start",function(t){var e=t[0];e instanceof Event&&(this.bstStart=Date.now())}),n.on("fn-end",function(t,e){var n=t[0];n instanceof Event&&r("bst",[n,e,this.bstStart,Date.now()])}),o.on("fn-start",function(t,e,n){this.bstStart=Date.now(),this.bstType=n}),o.on("fn-end",function(t,e){r("bstTimer",[e,this.bstStart,Date.now(),this.bstType])}),i.on("fn-start",function(){this.bstStart=Date.now()}),i.on("fn-end",function(t,e){r("bstTimer",[e,this.bstStart,Date.now(),"requestAnimationFrame"])}),n.on("pushState-start",function(){this.time=Date.now(),this.startPath=location.pathname+location.hash}),n.on("pushState-end",function(){r("bstHist",[location.pathname+location.hash,this.startPath,this.time])}),"addEventListener"in window.performance&&(window.performance.addEventListener("webkitresourcetimingbufferfull",function(){r("bstResource",[window.performance.getEntriesByType("resource")]),window.performance.webkitClearResourceTimings()},!1),window.performance.addEventListener("resourcetimingbufferfull",function(){r("bstResource",[window.performance.getEntriesByType("resource")]),window.performance.clearResourceTimings()},!1)),document.addEventListener("scroll",e,!1),document.addEventListener("keypress",e,!1),document.addEventListener("click",e,!1)}},{1:10,2:9,3:8,ee:"QJf3ax",handle:"D5DuLP",loader:"G9z0Bl"}],7:[function(t,e){function n(t){i.inPlace(t,["addEventListener","removeEventListener"],"-",r)}function r(t){return t[1]}var o=(t(1),t("ee").create()),i=t(2)(o),a=t("gos");if(e.exports=o,n(window),"getPrototypeOf"in Object){for(var s=document;s&&!s.hasOwnProperty("addEventListener");)s=Object.getPrototypeOf(s);s&&n(s);for(var c=XMLHttpRequest.prototype;c&&!c.hasOwnProperty("addEventListener");)c=Object.getPrototypeOf(c);c&&n(c)}else XMLHttpRequest.prototype.hasOwnProperty("addEventListener")&&n(XMLHttpRequest.prototype);o.on("addEventListener-start",function(t){if(t[1]){var e=t[1];"function"==typeof e?this.wrapped=t[1]=a(e,"nr@wrapped",function(){return i(e,"fn-",null,e.name||"anonymous")}):"function"==typeof e.handleEvent&&i.inPlace(e,["handleEvent"],"fn-")}}),o.on("removeEventListener-start",function(t){var …
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5
推荐指数
2
解决办法
1万
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