JQuery批量操作DOM元素

Question

<div id="dsize">    <div id="1">111</div>... 批量生成的div...<div id="N">454</div>   </div>var $dsize = $("#dsize");            for (var i = 0; i < $dsize.length; i++) {                $dsize.eq(i).click(function () {                    $dsize.eq(i).addClass("on");//为什么加不上样式                    //$dsize.eq(i).css("color", "red");//这样也加不上样式                })            }补充：这是完整的代码包括取值$(document).ready(function () {            var ID = $("#txtID").val();            var url = $.format("../../Controls/InfoHandler.ashx?param={0}", "getinfo");            $.getJSON(url, function (data, status) {                for (var i = 0; i < data.length; i++) {                    $("#dsize").append(                        "<div id="+data[i].InvID+">" + data[i].Size + "</div>"                        );                }            });            var $dsize = $("#dsize");            for (var i = 0; i < $dsize.length; i++) {                $dsize.eq(i).click(function () {                    $dsize.eq(i).addClass("on");                    //alert($dsize.eq(i).attr("class"));                    //$dsize.eq(i).css("color", "red");                })            }        });

Answer 1

var $dsize = $("#dsize");改成

var $dsize = $("#dsize").children();

Answer 2

$dsize.length什么意思，难道还有几个？