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JS 参考手册
JavaScript Date prototype 属性
tryjsref_prototype_date
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<!DOCTYPE html> <html> <body> <p>单击按钮调用新的 myMet() 方法，并使用新的 myProp 属性显示本月的名称。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> Date.prototype.myMet = function() { if (this.getMonth() == 0){this.myProp = "January"}; if (this.getMonth() == 1){this.myProp = "February"}; if (this.getMonth() == 2){this.myProp = "March"}; if (this.getMonth() == 3){this.myProp = "April"}; if (this.getMonth() == 4){this.myProp = "May"}; if (this.getMonth() == 5){this.myProp = "June"}; if (this.getMonth() == 6){this.myProp = "July"}; if (this.getMonth() == 7){this.myProp = "August"}; if (this.getMonth() == 8){this.myProp = "September"}; if (this.getMonth() == 9){this.myProp = "October"}; if (this.getMonth() == 10){this.myProp = "November"}; if (this.getMonth() == 11){this.myProp = "December"}; }; function myFunction() { var d = new Date(); d.myMet(); document.getElementById("demo").innerHTML = d.myProp; } </script> </body> </html>