The module.exports object is created by the Module system. Sometimes this is not acceptable; many want their module to be an instance of some class. To do this, assign the desired export object to module.exports. Note that assigning the desired object to exports will simply rebind the local...
let defineProp =function ( obj, key, value ){ let config = {}; config.value = value; Object.defineProperty( obj, key, config ); };//4. Object.defineProperties方式(同时设置多个属性)// 设置属性 Object.defineProperties( obj, {"firstKey": { value:"Hello World", writable: true },"seco...
"lang" is a variable which points to the memory location which stores the string value "javascript". So we can say that a variable is just a name to the memory location, where the value will be stored.
// 1. “点号”法// 设置属性obj.firstKey="Hello World";// 获取属性letkey=obj.firstKey;// 2. “方括号”法// 设置属性obj["firstKey"]="Hello World";// 获取属性letkey=newObject["firstKey"];// 方法1和2的区别在于用方括号的方式内可以写表达式// 3. Object.defineProperty方式// 设置属性...
WinJS.UI.Pages.define("/pages/home/home.html", { ready: function (element, options) { var people = [ { name: "John", age: 18, favoriteColor: "red" }, { name: "Tom", age: 16, favoriteColor: "green" }, { name: "Chris", age: 42, favoriteColor: "blue" }, ...
In the following code, you add a listener for the click event and define an event handler function that the browser executes when the click event occurs. JavaScript Copy switcher.addEventListener('click', function() { document.body.classList.toggle('light-theme'); document.body.classList....
using Microsoft.AspNetCore.Components; using Microsoft.JSInterop; namespace BlazorSample.Components; public partial class SurveyPrompt : ComponentBase, IObserver<ElementReference>, IDisposable { private IDisposable? subscription = null; [Parameter] public IObservable<ElementReference>? Parent { get;...
And just to be sure we’ve stored a reference to a function, let’s print out the value of our newwhoAmIvariable: console.log(whoAmI); Outputs: function() {console.log(this); } It looks fine so far. But look at the difference when we invokeobj.whoAmI()versus our convenience reference...
$ node es6_demo.js2/Users/jack/WebstormProject/node-tutorials/hello-node/es6_demo.js:8b=b+1;^TypeError:Assignment to constant variable.at Object.<anonymous>(/Users/jack/WebstormProject/node-tutorials/hello-node/es6_demo.js:8:3)at Module._compile(internal/modules/cjs/loader.js:688:30)at ...
class Expression { // Static factory method: public static Expression parse(String str) { if (...) { return new Addition(...); } else if (...) { return new Multiplication(...); } else { throw new ExpressionException(...); } } } ... Expression expr = Expression.parse(someStr...