javascript--Analog web crawler

Source: Internet
Author: User

1<!doctype html>234<meta charset= "UTF-8" >5<title>Document</title>6<script>7     functionGeturls () {8       varreg=9/<a\s+[^>]*?href=[' "] ([^ '"]+?) [‘"] [^>]*?>/G;Ten       varArr=NULL;//declaring variable arr, initialized to null One       //gets the contents of the BODY element, saved in the variable HTML A       varHtml=Document.body.innerHTML; -       //repeatedly finds a string in HTML that conforms to the Reg rule, and saves it in arr, if ARR is not equal to NULL, continue looking for -        while((arr=reg.exec (HTML))! =NULL){ the         //arr: ["<a ....>", "http://..."] -         //output The A element found this time -Console.log (arr[1]); -                   //regexp.$1 take out the child of the first group of this match +       } -     } +</script> A at<body> -<link href= "Index.css"/><body><a class= "header" href= "http://tedu.cn" >go to Tedu</a>

-<button onclick= "Geturls ()" > Start crawler </button> -</body> -

javascript--Analog web crawler

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