js数组的sort排序详解

废话少说直接上代码:

<body>
    <div>
    sort()对数组排序,不开辟新的内存,对原有数组元素进行调换
    </div>
    <div id="showBox">
    1、简单数组简单排序
    <script type="text/javascript">
        var arrSimple=new Array(1,8,7,6);
        arrSimple.sort();
        document.writeln(arrSimple.join());
    </script>
    </div>
    <div>
    2、简单数组自定义排序
    <script type="text/javascript">
        var arrSimple2=new Array(1,8,7,6);
        arrSimple2.sort(function(a,b){
            return b-a});
        document.writeln(arrSimple2.join());
    </script>
    解释:a,b表示数组中的任意两个元素,若return > 0 b前a后;reutrn < 0 a前b后;a=b时存在浏览器兼容
    简化一下:a-b输出从小到大排序,b-a输出从大到小排序。
    </div>
    <div>
    3、简单对象List自定义属性排序
    <script type="text/javascript">
        var objectList = new Array();
        function Persion(name,age){
            this.name=name;
            this.age=age;
            }
        objectList.push(new Persion('jack',20));
        objectList.push(new Persion('tony',25));
        objectList.push(new Persion('stone',26));
        objectList.push(new Persion('mandy',23));
        //按年龄从小到大排序
        objectList.sort(function(a,b){
            return a.age-b.age});
        for(var i=0;i<objectList.length;i++){
            document.writeln('<br />age:'+objectList[i].age+' name:'+objectList[i].name);
            }
    </script>
    </div>
    <div>
    4、简单对象List对可编辑属性的排序
    <script type="text/javascript">
        var objectList2 = new Array();
        function WorkMate(name,age){
            this.name=name;
            var _age=age;
            this.age=function(){
                if(!arguments)
                {
                    _age=arguments[0];}
                else
                {
                    return _age;}
                }
                
            }
        objectList2.push(new WorkMate('jack',20));
        objectList2.push(new WorkMate('tony',25));
        objectList2.push(new WorkMate('stone',26));
        objectList2.push(new WorkMate('mandy',23));
        //按年龄从小到大排序
        objectList2.sort(function(a,b){
            return a.age()-b.age();
            });
        for(var i=0;i<objectList2.length;i++){
            document.writeln('<br />age:'+objectList2[i].age()+' name:'+objectList2[i].name);
            }
    </script>
    </div>
</body>

谢谢关注!

posted @ 2012-11-27 17:53  龙则  阅读(255740)  评论(17编辑  收藏  举报