// 外层函数,全局作用域varouter=function(){// 内层函数,局部作用域varlocalInner=function(){// ...};// 内层函数,全局作用域globalInner=function(){// ...};}// 检测外层函数console.log(typeofouter);// 'function'// 运行外层函数来创建一个新的函数outer();// 检测新的函数console.log(typeof...
ais alocal variabledefined inside the function: functionmyFunction() { leta =4; returna * a; } Try it Yourself » Global Variables Aglobal variableis a "public" variable definedoutsidea function. Afunctioncan access all variables in theglobal scope: ...
Change the Value of a Global Variable Inside a Function The value of a global variable can be changed inside a function. For example, // Program to show the change in global variableleta ="hello"; functiongreet(){// change value of global variable aa =3; } // before the function call...
// Two slashes start single-line commentsvarx;// declaring a variablex=3+y;// assigning a value to the variable `x`foo(x,y);// calling function `foo` with parameters `x` and `y`obj.bar(3);// calling method `bar` of object `obj`// A conditional statementif(x===0){// Is ...
The function identifier (String) is relative to the global scope (window). To call window.someScope.someFunction, the identifier is someScope.someFunction. There's no need to register the function before it's called. Pass any number of JSON-serializable arguments in Object...
function sloppyFunc() { sloppyVar = 123; } sloppyFunc(); // creates global variable `sloppyVar` console.log(sloppyVar); // 123 在严格模式下,对未声明的变量进行赋值会引发异常: function strictFunc() { 'use strict'; strictVar = 123; ...
varmap;//Global variablerequire(["esri/map"],function(Map) { map =newMap("myMap", {basemap:"national-geographic"}); }); }); 这意味着我们可以在浏览器控制台中访问地图的属性。在缩放地图和所需的范围作为地图初始范围之后,使用Ctrl+Shift+I命令(在 Chrome 中)打开开发者工具。在 JavaScript ...
addEvent(document,'click',function(e){console.log('document');}); addEvent('html','click',function(e){console.log('html');}) addEvent(window,'click',function(e){console.log('window');}) }); addEventListener 方法有第三个可选参数,称为 use...
BREAKING CHANGE in v6.0.0; now mutually exclusive with --grep. Cause Mocha to only run tests having titles containing the given string. Mutually exclusive with --grep. # --grep <regexp>, -g <regexp> BREAKING CHANGE in v6.0.0; now mutually exclusive with --fgrep. ...
In a function,thisrefers to theglobal object. In a function, in strict mode,thisisundefined. In an event,thisrefers to theelementthat received the event. Methods likecall(),apply(), andbind()can referthistoany object. Note thisis not a variable. It is a keyword. You cannot change the...