html运行实例（js_assign_nullish）-搜寻教程库

代码示例：（标识：js_assign_nullish）

<!DOCTYPE html>
<html>
<body>

<h1>JavaScript 赋值</h1>

<h2>空值合并赋值</h2>

<h3>??= 运算符</h3>

<p id="demo"></p>

<script>
let x = 100;
x ??= 5;
document.getElementById("demo").innerHTML = "x 的值是：" + x;
</script>

</body>
</html>