Java Script随笔

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function $(id){
    return typeof id === 'string' ? document.getElementById(id) : id;
}

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for (var i = 0; i < titles.length; i++) {
            //添加索引
            titles[i].value = i;
            titles[i].onmouseover = function(){
                for (var j = 0; j < titles.length; j++) {
                    titles[j].className = "";
                    //隐藏
                    news[j].style.display = 'none';
                }
                this.className = 'select';
                news[this.value].style.display = 'block';
            }
        }

定时器

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timer = setInterval(autoPlay,2000);
clearInterval(timer);
//bug
if (timer) {
        clearInterval(timer);
        timer = null;
    }
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timer = setTimeout(autoPlay,2000);
clearTimeout(timer);