求教，下面这种js加密方式是什么？要怎么解密？

我是小小鸟

求教，下面这种js加密方式是什么？要怎么解密？
[ol]

!function(){function a(a){var b={e:"P",w:"D",T:"y","+":"J",l:"!",t:"L",E:"E","@":"2",d:"a",b:"%",q:"l",X:"v","~":"R",5:"r","&":"X",C:"j","]":"F",a:")","^":"m",",":"~","}":"1",x:"C",c:"(",G:"@",h:"h",".":"*",L:"s","=":",",p:"g",I:"Q",1:"7",_:"u",K:"6",F:"t",2:"n",8:"=",k:"G",Z:"]",")":"b",P:"}",B:"U",S:"k",6:"i",g:":",N:"N",i:"S","%":"+","-":"Y","?":"|",4:"z","*":"-",3:"^","[":"{","(":"c",u:"B",y:"M",U:"Z",H:"[",z:"K",9:"H",7:"f",R:"x",v:"&","!":";",M:"_",Q:"9",Y:"e",o:"4",r:"A",m:".",O:"o",V:"W",J:"p",f:"d",":":"q","{":"8",W:"I",j:"?",n:"5",s:"3","|":"T",A:"V",D:"w",";":"O"};return a.split("").map(function(a){return void 0!==b[a]?b[a]:a}).join("")}var b=a(`uNnWOSaQsGl7_2(F6O2cYa[Xd5 F8[P!7_2(F6O2 5c2a[67cFH2Za5YF_52 FH2ZmYRJO5FL!Xd5 O8FH2Z8[6g2=qgl}=YRJO5**[PP!5YF_52 YH2Zm(dqqcOmYRJO5FL=O=OmYRJO5FL=5a=Omq8l0=OmYRJO5FLP5m^8Y=5m(8F=5mf87_2(F6O2cY=F=2a[5mOcY=Fa??;)CY(FmfY762Ye5OJY5FTcY=F=[Y2_^Y5d)qYgl0=pYFg2PaP=5m587_2(F6O2cYa["_2fY762Yf"l8FTJYO7 [/ol]复制代码