const calculator = { value: 0, add(num) { this.value += num; return this; }, subtract(num) { this.value -= num; return this; }, multiply(num) { this.value *= num; return this; }, getValue() { return this.value; },}; const result = calc...
Returns the value of the specified style property. Note: The getPropertyValue method is supported in Internet Explorer from version 9. In older Internet Explorer versions (and in newer ones as well), the getAttribute method provides similar functionality
setProperty(propertyName, value, priority),设置 CSS 属性 propertyName 的值为 value, priority 是"important"或空字符串 计算样式 style 对象中包含支持 style 属性的元素为这个属性设置的样式信息,但不包含从其他样式表层叠继承的同样影响该元素的样式信息。DOM2 Style在 document.defaultView 上增加了 getComputed...
var$ =function(id){returndocument.getElementById(id);}; alert($('link').getAttribute('href'));//#alert($('link').href);//fullpath/file.html#alert($('image').getAttribute('src'))//img.pngalert($('image').src)//fullpath/img.pngalert($('ipt').getAttribute('value'))//enter ...
//Error: Invalid property descriptor.Object.defineProperty({},'prop', {get() {return1}, value:2}); 更聪明的 getter/setter getter/setter 可以用作“真实”属性值的包装器,以便对它们进行更多的控制。 例如,如果我们想禁止太短的user的 name,我们可以创建一个 settername,并将值存储在一个单独的属性_na...
varrectangle={sizeType:'四边形',getSize:function(){console.log(this.sizeType)}};varsquare=Object.create(rectangle,{sizeType:{value:'正方形'}});rectangle.getSize();// "四边形"square.getSize();// "正方形"// 判断对象是否包含特定的自身(非继承)属性console.log(rectangle.hasOwnProperty('getSize...
prop: function( elem, name, value ) { ... if ( value !== undefined ) { ... // 为名字为name的property属性赋值 return ( elem[ name ] = value ); } ... // 返回名字为name的property属性 return elem[ name ]; }, ... } ); ...
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...
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...
js中几种遍历对象的方法,包括for in、Object.keys、Object.getOwnProperty,它们在使用场景方面各有不同。 for in 主要用于遍历对象的可枚举属性,包括自有属性、继承自原型的属性 var obj = {"name":"Poly", "career":"it"} Object.defineProperty(obj, "age", {value:"forever 18", enumerable:false}); ...