[JS Framework] Failed to execute the callback function:

Recently in use uniapp When doing the Bluetooth function , Because it is necessary to realize disconnection and reconnection , Run into some problems .

uniapp Background threads are not supported ,worker This thing is divided into platforms , So it uses setTimeout The callback method implements reconnection . Report mistakes as headlines ：

The following usage is not rigorous , although html We often use this on the page .

Log in and copy

       

        setTimeout(func(),2000)
       
       

        
1.
       

  Changed to the following

Log in and copy

       

        setTimeout(function(){  
        
    return func()  
        
},2000)
       
       

        
1.
        
2.
        
3.
       

  That's all right. .

You need to declare in the form of a closure , Otherwise, there will be null pointer problems .