css比较弱项,请大神指点啊

现在我的easyui 调用了一个tree ,但是现实出来的时候 ,高度被限制了,li的高度根本就没有算进去,导致了显示的时候,内容折叠了
有没有好的方法,能够解决这个问题,在线等!
代码 :

  <div id="layout_show" class="easyui-layout" >
                <div data-options="region:'west',title:'分类规则列表',split:true,collapsible:false" style="width:200px">
                    <ul id="RuleTree" style="overflow: auto" class="easyui-tree"> </ul>
                </div>
                <div data-options="region:'center',title:'样本信息'" style="padding:5px;background:#eee;">
                    <table id="grid" width="100%"></table>
                </div>
            </div>

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高度限制,一般是最外层父容器高度固定,内层高度受限导致,试一下下面的
<script>
    $("#layout_show").css('width',$(window).width-100).css('height',$(window).height()-50);
</script>
<div id="layout_show" class="easyui-layout">
    <div data-options="region:'west',title:'分类规则列表',split:true,collapsible:false" style="width:20%;height:99%;">
            <ul id="RuleTree" style="overflow: auto" class="easyui-tree"> </ul>
    </div>
    <div data-options="region:'center',title:'样本信息'" style="padding:5px;background:#eee;width:80%;height:99%">
            <table id="grid" width="100%"></table>
    </div>
    </div>

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把树结构的json数据贴出来我看一下

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测试过,结果是对的,就是被前提在layout中,会出现问题
图片说明

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我简单写了个测试下,没问题,要不你本地替换一下,引用文件用你本地自己的
<html>
<head>
<meta charset="utf-8    ">
<link rel="stylesheet" type="text/css" href="../themes/default/easyui.css">
<link rel="stylesheet" type="text/css" href="../themes/icon.css">
<script type="text/javascript" src="../jquery.min.js"></script>
<script type="text/javascript" src="../jquery.easyui.min.js"></script>
<script>
    var treeJsons=[
    {id:5,
    text:"test2",
    state:"open",
    children:[
        {id:6,text:"test1",state:"open"}
    ]},
    {id:4,
    text:"测试中文",
    state:"open",
    children:[
        {id:1,text:"test1",state:"open"},
        {id:2,text:"test2",state:"open"},
        {id:3,text:"test2",state:"open"},
        {id:4,text:"test3",state:"open"},
        {id:5,text:"test4",state:"open"},
        {id:6,text:"test5",state:"open"},
        {id:7,text:"test6",state:"open"},
        {id:8,text:"test7",state:"open"},
        {id:9,text:"test8",state:"open"},
        {id:10,text:"test9",state:"open"},
        {id:11,text:"test10",state:"open"},
        {id:12,text:"test11",state:"open"},
        {id:13,text:"test12",state:"open"},
        {id:14,text:"test13",state:"open"},
        {id:15,text:"test14",state:"open"},
        {id:16,text:"test5",state:"open"}
    ]}
    ]
    $(function(){
        $("#tg").tree({
            data:treeJsons
        });
    })
</script>
</head>
<body>
    <div class="easyui-layout" style="width:700px;height:350px;">
                <div data-options="region:'west',split:true" title="分类规则列表" style="width:20%;">
            <ul id="tg" class="easyui-tree" data-options="animate:true,lines:true" style="padding-top:30px;"></ul>
        </div>

        <div data-options="region:'center',title:'样本信息',iconCls:'icon-ok'">
                        <table class="easyui-datagrid"
                                        data-options="border:false,singleSelect:true,fit:true,fitColumns:true">
                                <thead>
                                        <tr>
                                                <th data-options="field:'itemid'" width="80">Item ID</th>
                                                <th data-options="field:'productid'" width="100">Product ID</th>
                                                <th data-options="field:'listprice',align:'right'" width="80">List Price</th>
                                                <th data-options="field:'unitcost',align:'right'" width="80">Unit Cost</th>
                                                <th data-options="field:'attr1'" width="150">Attribute</th>
                                                <th data-options="field:'status',align:'center'" width="60">Status</th>
                                        </tr>
                                </thead>
                        </table>
                </div>
        </div>

</body>
</html>