What's the execution pattern of this function?

[ansi]

function getElementsByClass(className) {
    var all = document.all ? document.all : document.getElementsByTagName('*');
    var elements = new Array();
    for (var i = 0; i < all.length; i++)
        if (all[i].className == className)
            elements[elements.length] = all[i];
    return elements;
}

the function shown above is a javascript fuction.i would like to know the execution Pattern of getElementByClass()

[pbmods]

Heya, ansi. Welcome to TSDN!

Please use CODE tags when posting source code. See the REPLY GUIDELINES on the right side of the page next time you post.

Changed thread title to better describe a problem (threads tend to get more responses when the title contains nouns *and* verbs, with emphasis on plural).

[gits]

moved from js-articles-section to the js-forum ...

[acoder]

function getElementsByClass(className) {
    var all = document.all ? document.all : document.getElementsByTagName('*');
    var elements = new Array();
    for (var i = 0; i < all.length; i++)
        if (all[i].className == className)
            elements[elements.length] = all[i];
    return elements;
}

the function shown above is a javascript fuction.i would like to know the execution Pattern of getElementByClass()

What do you not understand in this function? It gets the elements in the document with a particular class name.