函数可以接收作为值传递给它的参数(arguments),函数可以被用来提供返回值(return value),也可以通过调用(invoking)被多次执行。 代码语言:javascript 复制 // 一个带有2个参数的基本函数:functionadd(one,two){returnone+two;}// 调用这个函数并给它2个参数:varresult=add(1,42);console.log(result);// 43//...
Dealing with pure functions that return values is easier to reason about than side effects. Use map() / every() / filter() / find() / findIndex() / reduce() / some() / ... to iterate over arrays, and Object.keys() / Object.values() / Object.entries() to produce arrays so ...
fn.button.noConflict() // return $.fn.button to previously assigned value $.fn.bootstrapBtn = bootstrapButton // give $().bootstrapBtn the Bootstrap functionality 事件 Bootstrap 为大部分插件所具有的动作提供了自定义事件。一般来说,这些事件都有不定式和过去式两种动词的命名形式,例如,不定式形式的...
function createPerson(name) { return { name, greet() { console.log(`Hello ${this.name}`); } }; } 1. 2. 3. 4. 5. 6. 7. 8. 创建方式对比 对象原理 核心特性 原型链机制:通过__proto__实现继承链 属性描述符: Object.getOwnPropertyDescriptor(obj, 'prop') 1. configurable enumerable wri...
* @returns The sum of the two numbers. */ function add(first, second){ return first + second; } JSDoc 程式碼註解描述程式碼註解中的 JSDoc 標記可用來產生 JSON 中繼資料檔案,描述 Excel 的自訂函數。 JSON 中繼資料檔案可讓 Excel 正確地向使用者呈現資訊,並將預期的參數傳遞至您的自訂函數。
The printprops() function is different: its job is to output the names and values of an object’s properties. No return value is necessary, and the function does not include a return statement. The value of an invocation of the printprops() function is always undefined. If a function doe...
affix({ offset: { top: 100, bottom: function () { return (this.bottom = $('.footer').outerHeight(true)) } } }) Options Options can be passed via data attributes or JavaScript. For data attributes, append the option name to data-, as in data-offset-top="200". Nametypedefault...
functioncompare(value1,value2){if(value1<value2){return1;}elseif(value1>value2){return-1;}else{return0;}};vararr=[89,23,45,99];console.log(arr.sort(compare)); reverse() reserve():反转数组项的顺序 代码语言:javascript 复制 vararr=[12,34,546,333];console.log(arr.reverse());console...
Disallows duplicate property names or parameter values.Strict mode throws an error when it detects a duplicate named property in an object (e.g.,var object = {foo: "bar", foo: "baz"};) or a duplicate named argument for a function (e.g.,function foo(val1, val2, val1){}), thereby...
ES6 allows function parameters to have default values. Example functionmyFunction(x, y =10) { // y is 10 if not passed or undefined returnx + y; } myFunction(5);// will return 15 Try it Yourself » Function Rest Parameter