passing a callback function javascript code example

Example 1: javascript pass this to callback

makeHTTPRequest('GET', 'http://youramazingapi/money_makers.php').then(function(data){
    this.shakeThose.push(data);
}.bind(this));

Example 2: how to pass callback function in javascript

function functionOne(x) { alert(x); }

function functionTwo(var1, callback) {
    callback(var1);		
}

functionTwo(2, functionOne);