树形图(菜单)构建组建dhtmlXTree
官方地址：http://www.dhtmlx.com/docs/products/dhtmlxTree/index.shtml
可以使用如下几种格式来构建树
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loadCSV - loads tree from csv file|stream
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loadCSVString - loads tree from csv string
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loadJSArray - loads tree from js array object
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loadJSArrayFile - loads tree from js array file|stream
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loadJSON - loads tree from json file
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loadJSONObject - loads tree from json object
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loadOpenStates - restores open nodes from cookie
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loadState - loads tree from cookie
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loadXML - loads tree from xml file
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loadXMLString - loads tree from xml string
具体用法可以到时在google查询或看官方的demo
