目次 |
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・constructorプロパティ ・型を調べる |
変数.constructor
<input type="button" value="ボタン" onclick="a();" /><br /><br /> <script type="text/javascript"> <!-- function a(){ var b = 3; var c = new String("aaa"); var d = new Date(); alert(b.constructor); alert(c.constructor); alert(d.constructor); } --> </script>
<input type="button" value="ボタン" onclick="b();" /><br /><br /> <script type="text/javascript"> <!-- function b(){ var b = 3; if(b.constructor === Number){ alert(b.constructor); } if(b.constructor == Number){ alert(b.constructor); } } --> </script>