# widgetBuild
函数用于创建bricks框架的控件实例。
## 语法
var w = widgetBuild(desc, widget)
## 参数说明
### desc
desc是一个对象类型数据，创建控件参数，必须有"widgettype", "options"属性, 可选属性有"subwidegets"，"binds"
### widget
widget是一个控件实例，用于解析desc中出现的url
## 返回值
* null 出错，可能1）widgettype类型未注册或不存在；2）json文件格式不对
* 新创建的控件实体
## 例子
tree.json
```
{
"widgettype":"Tree",
"options":{
"idField":"id",
"textField":"text",
"data":[
{
"id":1,
"text":"node1",
"is_leaf":false,
"children":[
{
"id":11,
"text":"node11",
"is_leaf":false,
"children":[
{
"id":112,
"text":"node.12",
"is_leaf":false,
"children":[
{
"id":1112,
"text":"node1112",
"is_leaf":true
},
{
"id":1113,
"text":"node113",
"is_leaf":true
}
]
},
{
"id":113,
"text":"node113",
"is_leaf":true
}
]
},
{
"id":12,
"text":"node12",
"is_leaf":true
},
{
"id":13,
"text":"node13",
"is_leaf":true
}
]
},
{
"id":2,
"text":"node2",
"is_leaf":false,
"children":[
{
"id":21,
"text":"node21",
"is_leaf":true
},
{
"id":22,
"text":"node22",
"is_leaf":true
},
{
"id":23,
"text":"node23",
"is_leaf":true
}
]
},
{
"id":3,
"text":"node3",
"is_leaf":true
}
]
}
}
```
tree.html
```
```
这是一个树形控件， 运行[这里](https://github.com/bricks/examples/tree.html)
更多的例子请看
[bricks控件例子](https://github.com/yumoqing/bricks/examples)