B: { default: function default() } C: { default: "Hello world", name: "Lydia" } D: Global object of module.js 答案 答案:A 使用import * as name语法,我们将module.js文件中所有export导入到index.js文件中,并且创建了一个名为data的新对象。在module.js文件中,有两个导出:默认导出和命名导出...
1.函数默认参数 function fn (num = 200) { console.log(num) }; fn() 或 fn(300); 2.async await可避免回调地狱。async function 大于 Promise,当然在多个 await 之间没有关联时, async await 假若出错将会中断执行,所以建议加上 try { 多条await语句位置 } catch (e) {};高端:let [a, b, c] ...
Function can be anonymous i.e. not have a name It doesn’t get hoisted to the top Example – let expression = function(num1, num2) { let sum = num1 + num2; return sum; } Arrow Function Arrow functions are also known as fat arrow functions. They were introduced in ES6. It ...
In the child component, $parent is used to retrieve the parent component instance. It's more difficult to test and debug the program, and you can't figure out where the mutation comes from. Vue also has a $child function that returns a child component instance, similar to $parent. 16. ...
Global Context:Whenthisis used outside of any function or object, it refers to the global object (e.g.,windowin a browser environment). Function Context:The value ofthisinside a function depends on how the function is called. It can be the global object or an object that the function is...
7. What is the control flow function? 8. Why is Node.js so popular these days? 9. Are there any disadvantages to using Node.js? 10. Explain the event-driven architecture of Node.js The number of Node.js jobs is on the rise, and this puts you up against increased competition. This...
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The time required to run this code in Google Chrome is considerably more than the time required to run it inNode.js. Explain why this is so, even though both use the v8 JavaScript Engine. View answer Within a web browser such as Chrome, declaring the variableioutside of any function’s...
[i].onclick = function(){ console.log(i+1);//不用闭包的话,值每次都是4 }(i); } 执行say667()后,say667()闭包内部变量会存在,而闭包内部函数的内部变量不会存在使得Javascript的垃圾回收机制GC不会收回say667()所占用的资源因为say667()的内部函数的执行需要依赖say667()中的变量这是对闭包作用...
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