<script type="text/javascript">

        window.onload = init;

        function init() {

            window.setInterval("star()", 1000);

        }

        function star() {

            var obj = document.createElement("img");

            obj.src = "../static/img/xingxing.gif";

            //随机星星大小

            var w = Math.floor(Math.random()*80 + 20);

            obj.width = w;

            //随机位置

            var x = Math.floor(Math.random()*1166+100);

            var y = Math.floor(Math.random()*500+100);

            obj.style.position = "absolute";

            obj.style.top = y + "px";

            obj.style.left = x + "px";

            document.body.appendChild(obj);

        }

    </script>

2.点击星星,星星消失

绑定事件onclick

//添加点击事件

 obj.onclick = removeStar;

在绑定事件中,this可以直接使用

obj.onclick = abc;

removeChild(obj)

//点击删除星星

        function removeStar() {

            this.parentNode.removeChild(this);

        }

window.onload = init;

        function init() {

            window.setTimeout("redirect()", 5000);

            window.setInterval("change()", 1000);

        }

        function change() {

            var obj = document.getElementById("d1");

            obj.innerHTML=obj.innerHTML - 1;

        }

        function redirect() {

            location.replace("http://www.baidu.com")

        }