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                            ## 使用的是瀏覽器自帶的api（測試的數據不是很準）
```
方法：
 connectionInfo(){
      const {rtt,downlink,effectiveType,saveData} = navigator.connection;
      console.log('有效的網絡連接類型',effectiveType);
      console.log('估算下行速度/帶寬',downlink + "Mb/s");
      console.log('估算往返時間',rtt + "ms");
      console.log('打開/請求數據保護模式',saveData);
    },
監聽：
    navigator.connection.addEventListener('change',this.connectionInfo())
```

![](https://img.kancloud.cn/90/74/907412d4454a88f5fb91218b83c43b4c_404x144.png)
**開發者工具中調試：如果網絡是無線或者5g，類型都會顯示4g**
![](https://img.kancloud.cn/91/80/9180448e2abc04009e021f4afb5b8e16_848x528.png)
**應用：**
    可以根據用戶的網絡類型和速度，動態去加載一些內容，如：3g時加載圖片，4g/5g/無線加載視頻
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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