开发学院网页设计JavaScript javascript十个最常用的自定义函数 阅读

javascript十个最常用的自定义函数

 2009-09-08 00:00:00 来源:WEB开发网   
核心提示: 01.var addLoadEvent = function(fn) { 02.var oldonload = window.onload; 03.if (typeof window.onload != 'function') { 04.window.onload = fn; 0

01.var addLoadEvent = function(fn) {
02.  var oldonload = window.onload;
03.  if (typeof window.onload != 'function') {
04.    window.onload = fn;
05.  }else {
06.    window.onload = function() {
07.      oldonload();
08.      fn();
09.    }
10.  }
11.}

(8) getElementsByClass()

我有收集癖,手头上拥有许多版本,最后集思广益自己实现了一个。下面是我的实现:

01.var getElementsByClassName = function (searchClass, node,tag) {
02.    if(document.getElementsByClassName){
03.        return  document.getElementsByClassName(searchClass)
04.    }else{
05.        node = node || document;
06.        tag = tag || "*";
07.        var classes = searchClass.split(" "),
08.        elements = (tag === "*" && node.all)? node.all : node.getElementsByTagName(tag),
09.        patterns = [],
10.        returnElements = [],
11.        current,
12.        match;
13.        var i = classes.length;
14.        while(--i >= 0){
15.            patterns.push(new RegExp("(^|\s)" + classes[i] + "(\s|$)"));
16.        }
17.        var j = elements.length;
18.        while(--j >= 0){
19.            current = elements[j];
20.            match = false;
21.            for(var k=0, kl=patterns.length; k<kl; k++){
22.                match = patterns[k].test(current.className);
23.                if (!match)  break;
24.            }
25.            if (match)  returnElements.push(current);
26.        }
27.        return returnElements;
28.    }
29.}

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