js 灵活写法

$(document).ready(initPage);
function initPage() {
alert((8).double1.square);//256
//也可以这样写
alert(8["double1"]["square"])
// 256
}

Number.prototype = Object.defineProperty(
Number.prototype, "double1", {
get: function (){return (this + this)}
}
);

Number.prototype =  Object.defineProperty(
Number.prototype, "square", {
get: function (){return (this * this)}
}
);