Question

function Dog(name, class, breed) {
this.name = name;
this.class = class;
this.breed = breed;
}

var harry= new Dog("harry", 15, "indian");
var tom = new Dog("tom", 16, "american");

document.write(tom.name);

这不会在浏览器中打印tom ..为什么?????

Answer 1

class是保留字，因此您不能将其用作属性名称。您可以将其更改为其他名称，例如Class要克服这个问题。

    function Dog(name, Class, breed) {
this.name = name;
this.Class = Class;
this.breed = breed;
}

Answer 2

这是因为您使用了class这个词，但class是一个保留词。所以用其他东西替换class。这就是你的代码应该是这样的。我用cls替换了class

    <!DOCTYPE html>
<html>
<body>
<script language="javascript" type="text/javascript">
<!--
function Dog(name, cls, breed) {
this.name = name;
this.cls = cls;
this.breed = breed;
}

var harry= new Dog("harry", 15, "indian");
var tom = new Dog("tom", 16, "american");
document.write(tom.name);
//-->
</script>
</body>
</html>

此代码不会在浏览器中打印tom

2 个答案: