how to compare two strings in javascript if condition

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You could check every option.

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

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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