Theelse ifstatement specifies a new condition if the first condition is false: if(condition1) { // block of code to be executed if condition1 is true }elseif(condition2) { // block of code to be executed if the condition1 is false and condition2 is true ...
mozilla.org/zh-CN/docs/Web/JavaScript/Guide/Grammar_and_types#%E5%9F%BA%E7%A1%80 JavaScript 是区分大小写的,并使用 Unicode 字符集。举个例子,可以将单词 Früh (在德语中意思是“早”)用作变量名。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 var Früh = "Ken"; var früh = "ken...
functionquote(str,config){const{char='"',skipIfQuoted=true}=config;constlength=str.length;if(skipIfQuoted&&str[0]===char&&str[length-1]===char){returnstr;}returnchar+str+char;}quote('Hello World',{char:'*'});// => '*Hello World*'quote('"Welcome"', { skipIfQuoted: true }); ...
When you write code, you will often need to use conditional statements, such as "if" statements. Here's an explanation of the JavaScript If statement.A conditional statement refers to a piece of code that does one thing based on one condition, and another based on another condition. In ...
'a simple statement'; 虽然JavaScript引擎通常能够在行结束时自动识别语句的结尾,但在代码中使用分号来明确结束语句是一种良好的编程实践。 注释的使用 注释用于解释代码,可以使代码更易于理解。在JavaScript中,单行注释由两个斜线//开始,而多行注释以一个斜线和星号/*开头,并以星号和斜线*/结尾。 // 这是单行...
if(x =="")throw"is Empty"; if(isNaN(x))throw"not a number"; if(x >10)throw"too high"; if(x <5)throw"too low"; } catch(err) { message.innerHTML="Input "+ err; } } Try it Yourself » Thefinallystatement executes code, after regardless of the try result: functionmyFunct...
Javascript Statement if Javascript examples for Statement:if HOME Javascript Statement if
This JavaScript tutorial explains how to use the if-else statement with syntax and examples. In JavaScript, the if-else statement is used to execute code when a condition is TRUE, or execute different code if the condition evaluates to FALSE.
log(i); //output = numbers between 0 and 9 } console.log(i) //error i is undefined Listing 3-3A let Statement Only Has a Value While Inside the Code Block 这里有一个循环。它创建一个名为i的变量,从值0开始,只要i没有值10,它就给i加1。
JavaScript includes three forms of if condition: if condition, if else condition and else if condition. The if condition must have conditional expression in brackets () followed by single statement or code block wrapped with . 'else if' statement must be placed after if condition. It can be ...