JavaScript – eval() 將字串當做JavaScript 代碼執行

let lang_tc = "這是繁體中文";
let lang_sc = "这是简体中文";
let lang_en = "This is English";

let type = "tc";

console.log(eval("lang_" + type)); // 結果是 "這是繁體中文"

console.log(eval('2 + 2')); // 結果是 4

console.log(eval('2 + 2') === eval('4')); // 結果是 true