删除DIV中的子节点

var myDiv = document.getElementById('my-div'),
    children = myDiv.childNodes,
    len = children.length,
    reg = /(?:\s|^)fooClass(?:\s|$)/;

while (len--) {
     if (reg.test(children[len].className || '')) {
         myDiv.removeChild(children[len]);
     }
}