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<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript 字符串</h1>
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<h2>includes() 方法</h2>
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<p>如果字符串包含指定的字符串，includes() 方法将返回 true。</p>
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<p>查找 "world"，从位置 12 开始：</p>
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<p id="demo"></p>
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<p>Internet Explorer 11（或更早版本）不支持 includes()。</p>
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<script>
let text = "Hello world, welcome to the universe.";
let result = text.includes("world", 12);
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document.getElementById("demo").innerHTML = result; 
</script>
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</body>
</html>
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