引用对象加不加括号区别

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>



</head>








<body>
<h1 id="demo1"></h1>
<h1 id="demo2"></h1>

<script>
    var person = {
        firstName: "John",
        lastName : "Doe",
        id : 5566,
        fullName : function()
        {
            return this.firstName + " " + this.lastName;
        }
    };
    document.getElementById("demo1").innerHTML = "不加括号输出函数表达式："  + person.fullName;
    document.getElementById("demo2").innerHTML = "加括号输出函数执行结果："  +  person.fullName();
</script>



</body>
</html>

引用对象加不加括号区别

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