How to change js Asynchronous method to Synchronize method

export const getUserToken = () => {
  let result = "";
  
  setupWebViewJavascriptBridge((bridge) => {
    bridge.callHandler("fetchUserInfo", (data) => {
      // 
      result = data;
    });
  });

  return result;
};

this is an interactive method between h5 and iOS, that is, an iOS method is called, iOS returns a parameter, and iOS is returned in a callback method. Calling this method returns the default empty string before it can be copied to result. Ask the gods to guide you how to write to return the normal results?

Html5 javascript
Apr.01,2021
Changing

to Synchronize is hard to implement. JS itself is an asynchronous event stream feature.
feel free to use callbacks. If your environment supports it, you can choose to use async / await to make the code look like Synchronize:

. 




resultasync/await


1.


export const getUserToken = (cb) => {
  setupWebViewJavascriptBridge((bridge) => {
    bridge.callHandler('fetchUserInfo', (data) => {
      // 
      cb && cb(data)
    });
  });
};

//

getUserToken(fucntion(data){
    console.log(data)
    //dada
})


 2.  async/await  Mode 


export const getUserToken = () => new Promise((resolve, reject) => {
  setupWebViewJavascriptBridge((bridge) => {
    bridge.callHandler('fetchUserInfo', (data) => {
      resolve(data)
    })
  })
})

// :

async function(){ //`await``data `
    const data = await getUserToken()
    console.log(data )
}

Previous: Weex uses vue framework, and dynamic binding class fails in native

Next: Php mysql grouping statistics takes the maximum and lowest values of the first and last pieces of data in the grouping.

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
© 2021 CodesHelper
Advertising Contact us About us
Menu