jquery easyui树形结构图标能改吗

可以，去改css文件

[{
	"id":1,
	"text":"Folder1",
	"iconCls":"icon-ok",  // 这个属性可以设置图标，是一个css类
	"children":[{
		"id":2,
		"text":"File1",
		"checked":true
	},{
		"id":3,
		"text":"Folder2",
		"state":"open",
		"children":[{
			"id":4,
			"text":"File2",
			"attributes":{
				"p1":"value1",
				"p2":"value2"
			},
			"checked":true,
			"iconCls":"icon-reload"
		},{
			"id": 8,
			"text":"Folder3",
			"state":"closed",
			"children":[{
				"id":9,
				"text":"File31"
			},{
				"id":10,
				"text":"File32"
			}]
		}]
	}]
},{
	"text":"Languages",
	"state":"closed",
	"children":[{
		"id":"j1",
		"text":"Java"
	},{
		"id":"j2",
		"text":"C#"
	}]
}]