将要访问
https://babeljs.io/repl/#?babili=false&browsers=&build=&builtIns=false&code_lz=PTBUAJS7wUQYwLYEMDK8BOBLADgF3ACYAGARgFZwAKWVANgEoAucAFQFNEcAbZPd8Nyz8MybgGcAUPAD2AO3EEARjJkBrcAF5wAb0nhwc5InYsA5ABl2yDHKxyA5uABSyAG5pMuAgBE-aPAwAV3g8IIx2cXBkOQATcABBbgcZbDwAC0RxM0kAXwBuSWl5cRludgA6bhkHKjMATRkg6IjwCORY-yczcABqcBV1CqMTPvAzCoAaAB05AEgY-IysKJXow3YAd0F7dlmFuPBS8DXl8QqzBkLihTLK6tqAA0bmmwF2zsdwABIdQbVhsZ2LkpvoDItwGcTlFkBttkI5OwweDDsdTukVhVHldJEA&debug=false&circleciRepo=&evaluate=true&lineWrap=true&presets=es2015%2Ces2016%2Ces2017%2Cstage-2&prettier=false&targets=&version=6.26.0
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