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<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript 语句</h1>
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<h2>let 语句</h2>
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<p>在循环中使用 <b>let</b>：</p>
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<p id="demo"></p>
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<script>
let text = "";
for (let i = 0; i < 5; i++) {
  text += i + "<br>";
}
document.getElementById("demo").innerHTML = text;
</script>
​
</body>
</html>
​