A function is a block of code that performs a certain task when called. For example, // function function greet(name) { console.log('Hi' + ' ' + name); } greet('Peter'); // Hi Peter Run Code In the above program, a string value is passed as an argument to the greet() ...
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...
functionsaveRecord(seq,callback){$.ajax({url:'${root}/saveOrUpdate.do',type:"post",async:true,success:function(result){//确保callback是一个函数类型的if(typeof(callback)==='function'){callback(true);}}});} main函数 代码语言:javascript 代码运行次数:0 运行 AI代码解释 //保存成功,才会打...
Here’s a JSBin with a nonfunction argument passed as the callback. A Note About Timing Although it is true that a callback function will execute last if it is placed last in the function, this will not always appear to happen. For example, if the function included some...
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...
//全局变量 var allUserData = []; //普通的logStuff函数,将内容打印到控制台 function logStuff (userData){ if ( typeof userData === "string") { console.log(userData); } else if ( typeof userData === "object"){ for(var item in userData){ console.log(item + ": " + userData[item...
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) }) ...
你这个应该是js的作用域的问题，js没有块级作用域，貌似在es6 use strict 模式下可以解决，但是浏览器...
JsCollectGarbage Function JsConstructObject Function JsConvertValueToBoolean Function JsConvertValueToNumber Function JsConvertValueToObject Function JsConvertValueToString Function JsCreateArray Function JsCreateArrayBuffer Function JsCreateContext Function JsCreateDataView Function JsCre...