如何有效地解决ie7,IE8不支持document.getElmentsByClassName的问题

1、复制此代码到你js代码的最前面即可

 

if(!document.getElementsByClassName){

document.getElementsByClassName = function(className, element){

var children = (element || document).getElementsByTagName('*');

var elements = new Array();

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

var child = children[i];

var classNames = child.className.split(' ');

for (var j=0; j<classNames.length; j++){

if (classNames[j] == className){ 

elements.push(child);

break;

}

}

} 

return elements;

};

}