js constructor属性

constructor属性返回对创建此对象的数组函数的引用。

语法：object.constructor

<script type="text/javascript">

var test=new Array();

if(test.constructor==Array)

{

  document.write("this is an array");

}

if(test.constructor==Boolen)

{

  document.write("this is a Boolen");

}

if(test.constructor==String)

{

document.write("this is a string");

}

</script>

 

输出：

This is an Array