📄 9-6 正则编译的效果.htm
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<head>
<meta http-equiv="content-type" content="text/html; charset=GB2312" />
<title>9-6 正则编译的效果</title>
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<style>
* { font-size:12px; font-family:宋体, Arial; } /*规定了所有的字体样式*/
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<script>
function init(){
var str, regObj, t01, t02, startTime;
str = "AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpAaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpAaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpAaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpAaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpAaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPp";
startTime = new Date();
regObj = /kLlMmNnOoPpAaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpAaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpAaBbCc/g;
for(var i=0; i<50000; i++){
str.match(regObj);
}
t01 = (new Date()) - startTime;
regObj = regObj.compile("kLlMmNnOoPpAaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpAaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpAaBbCc", "g");
startTime = new Date();
for(var i=0; i<50000; i++){
str.match(regObj);
}
t02 = (new Date()) - startTime;
alert("循环执行50000遍，\r\n未编译的正则耗时 "+t01+"毫秒，\r\n已编译的正则耗时"+t02+"毫秒");
}
window.onload = init;
</script>
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