function callAnotherFunc(fnFunction, vArgument) { fnFunction(vArgument); } var doAdd = new Function("iNum", "alert(iNum + 10)"); callAnotherFunc(doAdd, 10);//输出 "20" 在上面的例子中,callAnotherFunc() 有两个参数 - 要调用的函数和传递给该函数的参数。这段代码把 doAdd() 传递给 cal...
functionName.caller 获取调用当前函数的函数。 function CallLevel(){ if (CallLevel.caller == null) return("CallLevel was called from the top level."); else return("CallLevel was called by another function.");}document.write(CallLevel());// Output: CallLevel was called from the top level...
如果在字符串上下文中使用 caller 属性,那么结果和 functionName.toString 一样,也就是说,显示的是函数的反编译文本。 01functionCallLevel(){ 02if(CallLevel.caller == null) { 03alert("CallLevel was called from the top level."); 04}else{ 05alert("CallLevel was called by another function:\n"+...
A callback is a function passed as an argument to another function This technique allows a function to call another function A callback function can run after another function has finished Function Sequence JavaScript functions are executed in the sequence they are called. Not in the sequence they...
3function CreateJsPerson(name,age){//this 是当前类的一个实例 p1this.name=name; //=>p1.name=namethis.age=age; //=>p1.age=age}var p1=new CreateJsPerson("尹华芝",48);// 情况 4function add(c, d){ return this.a + this.b + c + d;}var o = {a:1, b:3};add.call(o...
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); ...
通过call或apply或bind调用 由于箭头函数没有自己的this指针，通过call()或apply()方法调用一个箭头函数时，只能传递参数（不能绑定this），他们的第一个参数会被忽略（这种现象对于bind方法同样成立）。varadder= {base : 1,add: function(a) {varf=v=>v+this.base;returnf(a); },addAnotherThis: ...
String.prototype.strictMethod = function () { 'use strict'; console.log(typeof this); // string console.log(this instanceof String); // false }; ''.strictMethod(); // call the above method 类型强制 类型强制意味着将一个类型的值隐式转换为另一个类型的值。JavaScript 的大多数运算符、函数...
// Create a function that accepts another function as an argument const callbackAcceptingFunction = (fn) => { // Calls the function with any required arguments return fn(1, 2, 3) } // Callback gets arguments from the above call const callback = (arg1, arg2, arg3) => { return ar...
A Function Declaration (abbreviated form is FD) is a function which: 函数声明(简写FD)是这样的一个函数 has an obligatory name; in the source code position it is positioned: either at the Program level or directly in the body of another function (FunctionBody); ...