闭包例子

闭输出小标
<script type="text/javascript">
        //创建数组元素
        var arr = new Array();

        for(var i=0; i<4; i++){
            arr[i] =snot(i)
        }

        function snot(n){
            return function(){
                console.log(n);
            }
        }


        arr[2]();  //2
        arr[0]();  //0
        arr[1]();  //1
        arr[3]();  //

        </script>
闭包鼠标放上实现五颜六色的效果

<script type="text/javascript">
window.onload = function() {
    var cars = document.getElementsByTagName(‘li‘);
    var col = [‘red‘, ‘blue‘, ‘green‘];
    for(var i=0; i<cars.length; i++){
        cars[i].onmouseover=over(i);
    }
    function over(n){
        return function(){
            cars[n].style.background=col[n];
        }
    }
}
</script>