复制代码 代码如下:

function getByClass(classname){

var nodes = document.getElementsByTagName('*'),

ret=[];

for(var i=0;i<nodes.length;i++){

if(hasClass(nodes[i],classname))

ret.push(nodes[i]);

}

return ret;

}

function hasClass(node,className){

var names = node.className.split(/s+/);

for(var i=0;i<names.length;i++){

if(names[i]==className)

return true;

}return false;

}