如何使用jQuery在自定义函数中创建回调

Question

I would like to create a custom callback function for a custom function and pass callback as a parameter.

function customFunction(a, b, callback) {
  // Some code
}

customFunction("val1", "val2", function(){
  //Code to execute after callback
});

Answer 1

You're almost there...

function customFunction(a, b, callback) {
    // Some code
    if (typeof callback === 'function') { 
        callback(); 
    }
}

customFunction("val1", "val2", function(){
  //Code to execute after callback
});

Answer 2

The solution of Coulson is good. To show it more clearly we can add the timeout function as follow:

function customFunction(a, b, callback) {
     setTimeout(function(){
      console.log("original function");
      callback();
     },1000);


}

$(document).ready(function() {
    $('#test').click(function() {
        customFunction("val1", "val2",function(){
            console.log("callback function");
       });
    });
});

Following is the link for check - https://jsfiddle.net/y0ch9exw/