$)") )
}
function addClass( elements, cName ) {
if( !hasClass( elements,cName ) ) {
elements.className += " " + cName;
}
}
function removeClass( elements, cName ){
if( hasClass( elements,cName ) ){
elements.className = elements.className.replace( new RegExp( "(\\s
关键词：javascript监听事件之监听页面滚动的内容解析