In JavaScript, you can also pass a function as an argument to a function. This function that is passed as an argument inside of another function is called a callback function. For example, // functionfunctiongreet(name, callback){console.log('Hi'+' '+ name); callback(); }// callbac...
看维基的Callback_(computer_programming)条目: In computer programming, a callback is a reference to a piece of executable code that is passed as an argument to other code. jQuery文档How jQuery Works#Callback_and_Functio…条目: A callback is a function that is passed as an argument to anoth...
Since the callback function is just a normal function when it is executed, we can pass parameters to it. We can pass any of the containing function’s properties (or global properties) as parameters to the callback function. In the preceding example, we passoptionsas a parameter to the ca...
we are only passing the function definition. We are not executing the function in the parameter. In other words, we aren’t passing the function with the trailing pair of executing parenthesis () like
function add(num1, num2, callback){ var sum = num1 + num2; callback(sum); } add(1, 2, function(sum){ console.log(sum); //=>3 }); 1. 2. 3. 4. 5. 6. 7. 8. 举例: <!DOCTYPE html> 匿名回调函数 function add(num1 ,num2 ,call...
afterLoad origin: {"anchor":"firstPage","item":{},"index":0,"isLast":false,"isFirst":true,"isActive":true} destination: {"anchor":"firstPage","item":{},"index":0,"isLast":false,"isFirst":true,"isActive":true} direction: null afterRender...
A callback is a function that is passed as an argument to another function and is executed after its parent function has completed. 解释得很明确,回调函数就是作为参数传递给另一个函数并在其父函数完成后执行的函数。 听起来似乎有点不好理解,所以还是举例进行说明,介绍回调函数之前先简单说明一下同步和...
http.get('https://api.github.com/users/Jhon', function(userData) { /* Display user with username 'Jhon' */ console.log(userData); }); }); }); 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 从上面的代码片段中,你可以看到代码变得更加难以理解,以及难以维护和修改。这是由回调函数...
//它就是回调函数 $("#btn_1").click(function() { alert("Btn 1 Clicked"); }); 正如你在前面的例子中看到的,我们将一个函数作为参数传递给了click方法。click方法会调用(或者执行)我们传递给它的函数。这是Javascript中回调函数的典型用法,它在jQuery中广泛被使用。
Turns an asynchronous function into a callback and includes the results of the callback in the invocation of the function: f1(input, f2.use(cb)) is equivalent to: f1('input', function(err, result) { if(err) return cb(err) f2(result, cb) }) ...