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                            [TOC]

> [參考](https://developer.mozilla.org/zh-CN/docs/Web/API/Page_Visibility_API)


## 概述
監聽頁面從前臺切到后臺,或從后臺切到前臺的狀態

## demo
```
var  visibilityChange;
if (typeof document.hidden !== "undefined") { // Opera 12.10 and Firefox 18 and later support
    visibilityChange = "visibilitychange";
} else if (typeof document.msHidden !== "undefined") {
    visibilityChange = "msvisibilitychange";
} else if (typeof document.webkitHidden !== "undefined") {
    visibilityChange = "webkitvisibilitychange";
}


document.addEventListener(visibilityChange,function (res) {
    if (document.hidden) {
        console.log("document.hidden" ,document.hidden);
    } else  {
        console.log("document.show" ,document.hidden);
    }
})
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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