Until arrow functions, every new function defined its own this value based on how the function was called。This proved to be less than ideal with an object-oriented style of programming. 箭头函数 箭头函数的this取值,规则非常简单,因为this在箭头函数中,可以看做一个普通变量。 An arrow function does...
function Person( name){ this.name = name; this.x=function(){ return this; } } let p = new Person("mcgrady"); console.log(p===p.x()) //true 1. 2. 3. 4. 5. 6. 7. 8. 9. AI检测代码解析 //严格模式下,函数中的this是undefined "use strict" function f(){ console.log(this...
Here,innerFunc()is defined using the arrow function. It takesthisfrom its parent scope. Hence,this.agegives25. When the arrow function is used withthis, it refers to the outer scope. 7. this Inside Function with Strict Mode Whenthisis used ina function with strict mode,thisisundefined. Fo...
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions D:\GPUGO\MP\wepy\mpBMCwepy\src\utils\wxRequest.js wepy bui
ES6 新增了一种新的函数: 箭头函数 Arrow Function 箭头函数相当于匿名函数,简化了函数定义,将原函数的 function 关键字和函数名都删掉,并使用 => 连接参数和函数体 1. ES6 前定义函数 AI检测代码解析 1. // function 关键字 ...
JavaScript In the example above, we’re invoking thesayHellofunction using thecall()andapply()methods and they both accept an object—greet1as their first argument. Explicitly invoking thesayHellofunction with these methods will force the function to use the objectgreet1for itsthisbinding in both ...
I've seen Javascript used in Animate that defines _this instead of this. For example: _this()stop; or _this.parent.gotoAndPlay vs. this()stop; or this.parent.gotoAndPlay The Adobe Press Animate book actually shows screenshots with both used. And, I understand Javascript requires det...
3 Select the Local Info category and type the folder path in the Local Root Folder field. 4 Click OK. Important: If the problem occurs with your remote site folder, repeat these steps for the Remote Folder in the Remote Info category. Unable to paste text from Word 2008 into Dreamweaver ...
function hello(thing) { console.log(this + " says hello " + thing); } hello.call("Yehuda", "world") //=> Yehuda says hello world 如你所见,hello方法的调用过程中,this被绑定到"Yehuda"上,而参数是"world"。这就是JavaScript最核心、基础的函数调用方式,核心原始方法。你可以认为其他所有的函数...
In other words, arrow functions treat this like any other lexical variable. 翻译:换句话说,箭头函数对待this就像对待任何其他词法变量一样 If you use a this inside an arrow function, it behaves exactly as any other variable reference, which is that the scope chain is consulted to find a function...