如果条件，如何在javascript中比较两个字符串 [英] how to compare two strings in javascript if condition

问题描述

我在回忆如何在if语句中比较这两个字符串时遇到麻烦.我要执行的字符串是检查我的变量compare是否等于page1或page2，如果不相等，请转到else语句.

I'm having trouble recalling how to compare these two strings in an if statement. What I'm string to do is check if my variable compare equals page1 or page2 if not, go to the else statement.

var compare = "page3";

if (compare === "page1" || "page2") {
  document.body.innerHTML = "github url";
} else {
  document.body.innerHTML = "non-github url";
}

推荐答案

您可以检查每个选项.

if (compare === "page1" || compare === "page2") {

或者您可以使用数组并使用诸如 Array#some 反对，例如

Or you could use an array and check with an existential quantifier like Array#some against, like

if (["page1", "page2"].some(a => a === compare)) {

var compare = "page3";

if (compare === "page1" || compare === "page2") {
    document.body.innerHTML = "github url";
} else {
    document.body.innerHTML = "non-github url";
}

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