模拟ES6的部分方法：
Number.[isFinite,isNaN,parseInt,parseFloat,isInteger,EPSILON,MAX_SAFE_INTEGER,MIN_SAFE_INTEGER,isSafeInteger]
Math.[trunc,sign,cbrt,fround,hypot,expm1,log1p,log10,log2]
Array.[form,of]
Array.prototype.[copyWithin,find,findIndex,fill,includes,keys,values,keys.next,values.next,entries,entries.next]
Function.prototype.[getLength]
String.prototype.[includes,startsWith,endsWith,repeat,padStart,padEnd,append,tag]
另外增加非ES6方法
Array.prototype.[delete,clear,has,insert,each,before,next]
Array.[each]
Object.[each]
Object.prototype.[each]
String.prototype.[format,trim,byteLen]
...
详细使用方法，请查看demo.html。