We name this function longRunningFunction:var longRunningFunction = (ip) => { //do long running tasks and return } If the longRunningFunction function is a pure function, then we know that for the given input, it is going to return the same output. With that point in mind, why do we ...
5.得到表单中元素的名称和值:document.getElementById("表单中元素的ID号").name(或value) 6.一个小写转大写的JS: document.getElementById("output").value = document.getElementById("input").value.toUpperCase(); 7.JS中的值类型:String,Number,Boolean,Null,Object,Function 8.JS中的字符型转换成数值型...
例 3.13.1 function A(name) { this.name = name; } A.prototype.info = function() { /*如果下局解开屏蔽,最后结果则打印出就为A,结论就是在call时,先在A里找this.name,如果找不着,则用b环境里找,现在A的构造函数从来没有执行过,所以最后用的是B环境的name,见下一个例子*/ //this.name...
Here, name is a function parameter, which acts as a placeholder to store the function argument.In other words, the argument "John" is stored in the name parameter.Remember: A function argument is the value we pass to the function, while a function parameter is a placeholder that stores the...
functionouter(){varname='JavaScript';functioninner(){console.log(name);}returninner;}varinnerFunc=outer();innerFunc();// 输出 'JavaScript' 在这个例子中,outer函数返回了inner函数。inner函数访问了outer函数的局部变量name,因此形成了一个闭包。即使outer函数执行完毕,name变量的引用仍然被保留,因此innerFunc...
constperson = {name:'John',age:25}; consthandler = {get:function(target, property){console.log(`Getting property${property}`);returnpropertyintarget ? target[property] :'Property not found';},set:function(target, property, value){if(...
The name of the function. Naming rules: same as JavaScript variables. parametersOptional. A set of arguments (parameter names), separated by commas. The arguments are real values received by the function from the outside. Inside the function, the arguments are used as local variables. ...
// 外部函数定义了一个名为“name”的变量 const pet = function (name) { const getName = function () { // 内部函数可以访问外部函数的“name”变量 return name; }; return getName; // 返回内部函数,从而将其暴露给外部作用域 }; const myPet = pet("Vivie"); console.log(myPet()); // "...
functionname(parameter1, parameter2, parameter3) { //code to be executed } Functionparametersare listed inside the parentheses () in the function definition. Functionargumentsare thevaluesreceived by the function when it is invoked. Inside the function, the arguments (the parameters) behave as loc...
15.js中地循环结构:for([initial expression];[condition];[upadte expression]) {inside loop} 16.循环中止地命令是:break 17.js中地函数定义:function functionname([parameter],...){statement[s]} 18.当文件中出现多个form表单时.可以用document.forms[0],document.forms[1]来代替. ...