JavaScript 的父類和子類可以使用同名的函式嗎?
是的,父類和子類可以具有同名的函式。
示例
class Parent { constructor(parentValue) { this.parentValue = parentValue; } //Parent class method name which is same as Child Class method name. showValues() { console.log("The parent method is called....."); console.log("the value is="+this.parentValue); } } class Child extends Parent { constructor(parentValue,childValue){ super(parentValue); this.childValue = childValue; } //Child class method name which is same as Parent Class method name. showValues() { console.log("The child method is called....."); console.log("The value is="+`${this.childValue}`); } } var parentObject = new Parent(100); parentObject.showValues(); var childObject = new Child(400,500); childObject.showValues();
要執行以上程式,你需要使用以下命令 −
node fileName.js.
這裡,我的檔名是 demo195.js。
輸出
這將產生以下輸出 −
PS C:\Users\Amit\javascript-code> node demo195.js The parent method is called..... the value is=100 The child method is called..... The value is=500
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