}else if(表达式/条件){ 为真的时候执行的代码 }else{ 为假的时候执行的代码 } // 成绩评价if(num>=90&& num<=100){console.log('优秀'); }elseif(num>=80&& num<90){console.log('良好'); }elseif(num>=60&& num<80){console.log('中等'); }elseif(num<60&& num>=0){console.log('差...
}elseif(condition2) { //block of code to be executed if the condition1 is false and condition2 is true }else{ //block of code to be executed if the condition1 is false and condition2 is false } Example If time is less than 10:00, create a "Good morning" greeting, if not, but...
no-else-return 现在,我们可以使用以下no-else-return语句简化此函数,因为无论如何我们返回的都是null: letnoElseReturns =(str) =>{if(typeofstr =="string"){if(str.length >1) {returnstr.slice(0,-1)}}returnnull}noElseReturns("")// =...
no-else-return 现在,我们可以使用以下no-else-return语句简化此函数,因为无论如何我们返回的都是null: let noElseReturns = (str) => { if (typeof str == "string"){ if (str.length > 1) { return str.slice(0,-1) } } return null } noElseReturns("") // => null noElseReturns("h")...
{returntrue;// if the year is divisible by 400 and by 100, it is not a leap year.}elseif(year%100==0){returnfalse;// if the year is divisible by 400, not divisible by 100, and divisible by 4, it is a leap year.}elseif(year%4==0){returntrue;}else{returnfalse;}}function...
If语句在JavaScript中只检查一次变量值。它是一种条件语句,用于根据条件的真假执行不同的代码块。 在JavaScript中,if语句的语法如下: ``` if (condition) { ...
当我们在 if-else 语句中有 3 个或更多分支,或者我们嵌套 if 时,更清晰的三元替代方案将包含内部三元运算符。 所以这个: const getNumWord = (num) => { if (num === 1) { return '一'; } else if (num === 2) { return '二';
2、用if...else...条件语句判断如果判断结果为true,会执行if中的语句,如果判断结果为false,则会执行else中的语句 ?...3、多条件判断使用elif (elif就是else if 的缩写) ? 4、if判断条件简写 if x: 只要x是非空list、非零数值、非空字符串,就判断为true,否则为false ? 2.4K10 Python入门 | 如何判断...
if (expression) statement; elsestatement; Alright, let's consider an example using else. We'll bring our rainy day example back and extend it to show two alerts — one when it is raining and one when it is not raining. In addition, we'll also change the dummy value of isRaining to...
}elseif(iWeek==5){ oBody.style.backgroundColor="lightblue"; }else{ oBody.style.backgroundColor="pink"; } } switch语句 多重if else语句可以换成性能更高的switch语句: var iNow = 1; switch(iNow){ case 1: ...; break; case 2: ......