当前窗口A为openWin打开的, 非预加载, 然后在窗口A中openWin打开B窗口, 然后关闭A窗口:代码如下：
```javascript
//打开新窗口
mui.openWindow({
id: "b",
urll: "b.html"
})...
```javascript
//打开新窗口
mui.openWindow({
id: "b",
urll: "b.html"
})...
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