constructor 屬性返回對創(chuàng)建此對象的 Boolean 函數(shù)的引用。
object.constructor
在本例中,我們將展示如何使用 constructor 屬性:
<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>
輸出:
This is a Boolean
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