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JavaScript constructor 属性

JavaScript基础 2022-06-08 11:02:55小码哥的IT人生shichen

JavaScript constructor 属性

定义和用法

constructor 属性返回对创建此对象的 Boolean 函数的引用。

语法

object.constructor

实例

在本例中,我们将展示如何使用 constructor 属性:

<script type="text/javascript">
var test=new Boolean();
if (test.constructor==Array)
{
document.write("This is an Array");
}
if (test.constructor==Boolean)
{
document.write("This is a Boolean");
}
if (test.constructor==Date)
{
document.write("This is a Date");
}
if (test.constructor==String)
{
document.write("This is a String");
}
</script>

输出:

This is a Boolean

完整实例【TIY】:

<html>
<body>
<script type="text/javascript">
var test=new Boolean();
if (test.constructor==Array)
{
document.write("This is an Array");
}
if (test.constructor==Boolean)
{
document.write("This is a Boolean");
}
if (test.constructor==Date)
{
document.write("This is a Date");
}
if (test.constructor==String)
{
document.write("This is a String");
}
</script>
</body>
</html>

可以使用本站在线JavaScript测试工具测试上述代码运行效果:http://www.phpcodeweb.com/runjs.html

TIY

完整实例【constructor】:

<html>
<body>
<script type="text/javascript">
var test=new Boolean();
if (test.constructor==Array)
{
document.write("This is an Array");
}
if (test.constructor==Boolean)
{
document.write("This is a Boolean");
}
if (test.constructor==Date)
{
document.write("This is a Date");
}
if (test.constructor==String)
{
document.write("This is a String");
}
</script>
</body>
</html>

可以使用本站在线JavaScript测试工具测试上述代码运行效果:http://www.phpcodeweb.com/runjs.html

在本例中,我们将展示如何使用 constructor 属性。

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