js Number对象 ：属性constructor

constructor 属性返回对创建此对象的 Boolean 函数的引用

<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>

结果为：This is a Boolean