1Object.defineProperty(myobj.prototype,'length',{23value:10,4writable:false,5configurable:true678});9vardescriptor =Object.getOwnPropertyDescriptor(myobj.prototype,10"length");1112descriptor.writable =true;13Object.defineProperty(myobj.prototype,'length',descriptor);14myobj.prototype.length = 100;15v...
使用这个Object.getPrototypeOf方法返回的就是当前实例对象中__proto__属性所指向的原型对象 同时constructor属性也的确指向了本身的构造函数 这样原型对象和实例对象之间就通过__proto__连接在一起,形成了一个链条, 而所谓的原型链也就是实例对象和原型对象之间的链条关系,__proto__这条线,也就是原型链的关键 并且这...
Object.create() Object.defineProperty() 属性描述符 描述符默认值汇总 描述符可拥有的键值 创建属性 修改属性 Writable 属性 Enumerable 属性 Configurable 属性 添加多个属性和默认值 自定义 Setters 和 Getters 继承属性 Object.defineProperties() Object.entries() Object.freeze() Object.getOwnPropertyDescriptors(...
要在字符串中插入反斜杠字面量,必须转义反斜杠。例如,要把文件路径赋值给一个字符串,可以采用如下方式: js consthome="c:\\temp"; 也可以在换行之前加上反斜杠以转义换行。这样反斜杠和换行都不会出现在字符串的值中。 js conststr="this string \ is broken \ across multiple \ lines.";console.log(str...
function(e){return t.flat.call(e)}:function(e){return t.concat.apply([],e)},u=t.push,i=t.indexOf,n={},o=n.toString,v=n.hasOwnProperty,a=v.toString,l=a.call(Object),y={},m=function(e){return"function"==typeof e&&"number"!=typeof e.nodeType},x=function(e){return null...
The Object.getOwnPropertyDescriptor() method returns a property descriptor for a specific property of an object. Example let obj = {num: 10} // get the property description // of the num property of obj let numValue = Object.getOwnPropertyDescriptor(obj, "num"); console.log(numValue);...
name of every property whose name is an array index; whenever a property of an Array object is...
Object.getOwnPropertyDescriptor("foo",0);// TypeError: "foo" is not an object // ES5 codeObject.getOwnPropertyDescriptor("foo",0);// Object returned by ES2015 code: {// configurable: false,// enumerable: true,// value: "f",// writable: false// } ...
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 This event is fired when the dropdown has been made visible to the user...
❮PreviousJavaScript ObjectReferenceNext❯ Example // Create an Object constperson = { firstName:"John", lastName:"Doe", age:50, eyeColor:"blue" }; // Get Properties letdescriptors = Object.getOwnPropertyDescriptors(person); Try it Yourself » ...