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<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript 数组</h1>
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<p>length 属性提供了一种在不使用 push() 方法的情况下将新元素附加到数组的简便方法。</p>
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<button onclick="myFunction()">试一试</button>
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<p id="demo"></p>
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<script>
var fruits = ["Banana", "Orange", "Apple", "Mango"];
document.getElementById("demo").innerHTML = fruits;
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function myFunction() {
  fruits[fruits.length] = "Lemon";
  document.getElementById("demo").innerHTML = fruits;
}
</script>
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</body>
</html>
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