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<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript 字符串</h1>
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<h2>startsWith() 方法</h2>
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<p>如果字符串以指定字符串开头，startsWith() 返回 true：</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 startsWith()。</p>
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<script>
let text = "Hello world, welcome to the universe.";
let result = text.startsWith("world", 7);
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document.getElementById("demo").innerHTML = result;
</script>
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</body>
</html>
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