classParent{method(){console.log('Parent method');}}classChildextendsParent{method(){super.method();console.log('Child method');}}constchild=newChild();child.method();// 输出:Parent method, Child method 使用call或appl
eat() {//...bounce around rabbit-style and call parent (animal) methodthis.__proto__.eat.call(this);//(*)} }; let longEar={ __proto__: rabbit, eat() {//...do something with long ears and call parent (rabbit) methodthis.__proto__.eat.call(this);//(**)} }; longEar.e...
该方法和call 以及apply其实一个意思,只不过通过不同的途径来保证父函数执行时,里面的this是自己 functionPerson() {this.s_name = "Person";this.f_say =function() { console.info(this.s_name); } }functionMan() {this.parent_method =Person;this.parent_method(this.arguments);//执行时Person函数,...
varModule=(function(){functionprivateMethod(){// do something}return{publicMethod:function(){// can call privateMethod();}};})(); Module 中的 return 语句包含了我们公开的函数。私有函数只是那些没有返回的函数。没有返回的函数不可以在 Module 命名空间之外访问。但是公开函数可以访问私有函数,这使它们...
All dropdown events are fired at the .dropdown-menu's parent element. All dropdown events have a relatedTarget property, whose value is the toggling anchor element. Event TypeDescription show.bs.dropdown This event fires immediately when the show instance method is called. shown.bs.dropdown Th...
parentMethod = function () {}; function Child() { Parent.call(this); // 确保所有内容都已正确初始化 } // 将 Child.prototype 的 [[Prototype]] 指向 Parent.prototype Child.prototype = Object.create(Parent.prototype); 由于重新赋值了 Child.prototype,Child 实例的 constructor 将是Parent。 通常...
@page "/prerendered-interop" @using Microsoft.AspNetCore.Components @using Microsoft.JSInterop @inject IJSRuntime JS <PageTitle>Prerendered Interop</PageTitle> Prerendered Interop Example Set value via JS interop call: @scrollPosition @code { private ElementReference divElement; private do...
The function to call when the event fires. Returns TypeDescription Object Returns an event handler with a remove() method that should be called to stop listening for the event(s). PropertyTypeDescription remove Function When called, removes the listener from the event. Example view.on("click...
numberB; } // use .call() method to modify the context return calculate.call(this); } }; numbers.sum(); // => 15 calculate.call(this) 会正常执行 calculate()函数,同时会将它的执行上下文变为所传入的第一个参数。 现在this.numberA + this.numberB 就相当于 number.numberA + numbers....
All dropdown events are fired at the .dropdown-menu's parent element. All dropdown events have a relatedTarget property, whose value is the toggling anchor element. Event TypeDescription show.bs.dropdown This event fires immediately when the show instance method is called. shown.bs.dropdown Th...