if(condition){ //条件判断 statement_1; //条件为真执行 }else{ statement_2; //其他情况 } 1. 2. 3. 4. 5. condition可以是任何返回结果备计算为true或false的表达式,通常0,false,undefined,null,Nan,""均为假。 你也可以组合语句通过使用 else if 来测试连续多种条件判断 if (condition_1) { stat...
if / elseallow us to add some branching logic in our code: regarding a condition we’ll do this or that operation. But there are sometimes more than 2 possibles branches. As a beginner developer, you might be starting usingelse if: if(name==='patrick'){sayHello()}elseif(name==='jan...
The else statement is another conditional statement in JavaScript. Unlike if, it couldn't be specified alone — there has to be an if statement preceding an else. So what's else used for? The else statement executes a piece of code if the condition in the preceding if statement isn't me...
customSwitch[1].condition = 40 }); $('#option2').click(function () { customSwitch[0].condition = 39 customSwitch[1].condition = 37 }); $(window).keydown(function (e) { for (const { condition, fn } of customSwitch) { if (e.keyCode === condition) { fn(e.keyCode); break; ...
代码块 ; 如果 condition1 / condition2 / condition3 条件 都为 false , 则执行最后的 else 代码块 ; if 语句 : let age: number...case 语句 TypeScript 语言 的 switch case 语句 语法 与 JavaScript 语言 基本相同 , 该条件语句结构可以根据 一个表达式的值 来执行不同的 case 代码块中的代码......
在JavaScript中,switch语句是一种条件控制结构,它允许变量或表达式的值与一系列的值进行比较,并执行相应的语句块。当用于判断成绩时,可以根据成绩的范围来执行不同的操作或返回不同的结果。 基础概念 switch语句的基本语法如下: 代码语言:txt 复制 switch (expression) { case value1: // 当 expression 等于 value...
javascript多条件js多条件判断 经常code review,我发现很容易写出一堆冗长的代码。今天就列几个比较常见的“解决之道”,看看如何减少JS里的条件判断。提前返回,少用if...else但是过多的嵌套,还是挺令人抓狂的。这里有一个很典型的条件嵌套:function func() { var result; if (conditionA) { if ...
a condition switch library for js/ts. Latest version: 0.1.1, last published: 8 months ago. Start using condition-switch in your project by running `npm i condition-switch`. There are no other projects in the npm registry using condition-switch.
You have to use logical OR, AND operator in switch case to use multiple values in JavaScript. Here is OR condition, anyone true will execute
else 语句if (condition) { code to run if condition is true } else { run some other code instead } Choose a name Please choose a option dog cat park var select = document.querySelector('#name_Ch'); var para = document.querySelector('#p_select'); function choose_func() {...