About how to write some JS

for example, if you want to write a callback, you can use promise: 

 function a(){
    return new Promise(function(res,rej){
        res()
    }) 
 }
 
 a().then()

but now I want the code to run directly in the browser instead of going through webpack (ES6 to 5).

then use 

var a = function(x){x();}
a(function(){
    console.log("")
})
//
Javascript
Mar.29,2021

you can use es5. You can use polyfill to support promise,. There is no need to use callback writing, and the compatibility is good

.

now most modern browsers support Promise (after all, some browsers' API returns this), and you can also use some compatible libraries to support it.

as for your second way of writing, which is the most traditional callback , all I can think of is the pointing control problem of this .

there will be no problem, please rest assured to use it.

Previous: Vue-awesome-swiper cannot use focusing after packing APP!

Next: The problem of vue calling parent components and calling child components

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
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e59e58-44cf6.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e59e58-44cf6.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?