Object.getOwnPropertyNames是es5中新增的方法，用来获取对象自身的全部属性名。
function getAllMethods(obj) {
return Object.getOwnPropertyNames(obj).filter(function(property) {
return typeof obj[property] == 'function';
});
}
console.info(getAllMethods(Math));
// abs acos acosh asin asinh atan atanh atan2 ceil cbrt expm1 clz32 cos cosh
// exp floor fround hypot imul log log1p log2 log10 max min pow random round
// sign sin sqrt tan tanh trunc sinh clamp degrees fscale iaddh isubh imulh
// radians scale umulh signbit
参考：
https://yanhaijing.com/javascript/2015/05/08/member-of-object/
https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyNames
https://stackoverflow.com/a/2946616
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