简单教程
提交运行
代码编辑器:
<p id="demo">单击按钮,如果boolean值为<em>true</em>显示“green”,否则显示“red”</p> <button onclick="myFunction()">点我</button> <script> Boolean.prototype.myColor=function(){ if (this.valueOf()==true){ this.color="green"; } else{ this.color="red"; } } function myFunction(){ var a = new Boolean(1); a.myColor(); var x=document.getElementById("demo"); x.innerHTML=a.color; } </script>
运行结果: