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<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript 运算符</h1>
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<h2>?. 运算符</h2>
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<p>如果对象为 undefined 或 null，则 ?. 运算符返回 undefined（而不是抛出错误）。</p>
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<p>汽车品牌是：</p>
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<p id="demo"></p>
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<script>
const car = {type:"Fiat", model:"500", color:"white"};
let name = car?.name;
document.getElementById("demo").innerHTML = name;
</script>
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</body>
</html>
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