Window top 属性
- Previous Page stop()
- Next Page alert()
- Go to the Previous Level Window Object
定义和用法
top 属性返回当前浏览器窗口中最顶层的窗口。
top 属性是只读的。
提示
top 属性与 parent 属性不同。
window.top 返回窗口层次结构中最顶层的窗口。
window.parent 返回窗口的直接父级。
另请参阅：
实例
这个窗口是最上面的窗口吗：
if (window.top != window.self) {
text = "This window is NOT the topmost window!";
} else {
text = "This window is the topmost window!";
}
Syntax
window.top
Return Value
| Type | Description |
|---|---|
| Object. | The top-level window in the window hierarchy of the current browser window. |
Browser Support
All Browsers Support window.top:
| Chrome | IE | Edge | Firefox | Safari | Opera |
|---|---|---|---|---|---|
| Chrome | IE | Edge | Firefox | Safari | Opera |
| Support | Support | Support | Support | Support | Support |
- Previous Page stop()
- Next Page alert()
- Go to the Previous Level Window Object
