javascript - 用多个 OR 简化 IF 语句 || 相同变量的条件

Question

这是我的代码

var something = "four";

if(
    something == "one" || 
    something == "two" || 
    something == "three" ||
    something == "five" ||
    something == "six" ||
    something == "seven"
){
    document.body.innerHTML = "<h1>yes</h1>";
}else{
    document.body.innerHTML = "<h1>no</h1>";
}

鉴于所有条件都考虑同一个变量，有没有办法简化 IF 语句？

演示

Answer 1

尝试这个：

var something = 4;

if([1,2,3,5,6,7].indexOf(something) > -1) {
 document.body.innerHTML = "<h1>yes</h1>";
} else {
 document.body.innerHTML = "<h1>no</h1>";
}

JSFiddle：http: //jsfiddle.net/2onn6Lc2/1/

另外，请在https://codereview.stackexchange.com/上发布此类问题

Answer 2

您可以随时反转您的支票：

var something = 4;

if(
    something < 1 || 
    something == 4 || 
    something >7
){
    document.body.innerHTML = "<h1>no</h1>";
}else{
    document.body.innerHTML = "<h1>yes</h1>";
}

Answer 3

let something = "four";

if ( ["one","two","three","five","six","seven"].includes(something) ) {
    document.body.innerHTML = "<h1>yes</h1>";
} else {
    document.body.innerHTML = "<h1>no</h1>";
}