下面中心代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<script type="text/javascript">
(function () {
try {
var report = function (id, obj,eventtype) {
obj.pageurl = location.href;
obj.ua = navigator.userAgent;
var json = "{ ";
for (var i in obj) {
json += "" + i + ":" + obj[i] + ", "
}
json += "}";
var src = "http://www.xxx.com/logservice?eventtype=" + eventtype + "&eventid=" + id +
"&extend=";
var img = new Image();
img.src = src + encodeURIComponent(json);
img.onload = img.onerror = function () {
img = null
}
};
if (window.addEventListener) {
var ingore = ["localhost"];
window.addEventListener("error", function (e) {
//抓取文件404报错
if (e.target && e.target.src) {
var obj = {};
obj.file = e.target.src;
for (var i = 0, len = ingore.length; i < len; i++) {
if (obj.file.indexOf(ingore[i]) > -1) {
return
}
}
report(404, obj,'jserror');
}
}, true);
}
window.onerror = function (msg, file, line) {
//抓取js通例报错
var obj = {};
obj.errmsg = msg;
obj.errfile = file;
obj.errline = line;
report(500, obj,'jserror');
}
window.onload = function()
{
setTimeout(function()
{
if (window.performance && window.performance.timing) {
//抓取页面机能时候
var perf = window.performance.timing ,obj = {};
var arr = ['navigationStart','domainLookupEnd','connectEnd','domContentLoadedEventEnd','loadEventEnd'];
arr.forEach(function(curv,i){
obj[curv] = perf[curv];
});
report(200, obj,'performance');
}
},1000);
}
} catch (e) {}
})();
</script>
</head>
<body>
<img src="http://www.test.com/aa.jpeg">
<img src="http://www.test.com/bb.jpeg">
<script type="text/javascript">
showme1();
</script>
</body>
</html>注重 解释 的“抓取文件404报错”，“抓取js通例报错”，“抓取页面机能时候”，代码很好明白，将全部操纵放在闭包内实行，以避免污染表面。 这段代码必需放在head标签头部内，若头部有js外联，那该段代码必需放在js外联之上，若将这段代码安排在http://www.xxx.com/logservice.js，那代码以下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<script type="text/javascript" src="http://www.xxx.com/logservice.js"></script>
<script type="text/javascript" src="其他js"></script>
</head>
<body>
//通例营业代码
</body>
</html>在猎取页面机能时候方面，先猎取，背景再去盘算。关于window.performance 方面，文章许多，详细内里每一个单词代表的时候意义，能够自行搜寻文档。如：前端机能监控计划window.performance 调研(转)。
