babel 转化+= await的问题

http://babeljs.io/repl/#?babili=false&browsers=&build=&builtIns=false&code_lz=DYUwLgBAHhC8EAYBQTSWAewOZwgMwFcA7AYzAEsMiAKASggG8kIISqBnDUAOky2qgAaCAHI-I2swgAncAWlEIAJgDcSAL4oAhuwCepfMTKVFYEOzB1GUgPQ3oEANTwtAdy3l02K3dY6QEACMUjDwMI4Qbh5e_PS-JP7KUmxEnDx8AsIiZhYSGig5lpJI4fDBKWkgvN5ColiYAEZawHlI8f7BvggQAER8PW32gb31GE3AA74AzL2FAyjt7CBKg4i9_avDPaPjk_ZKs-Zg80A&debug=false&forceAllTransforms=false&shippedProposals=false&circleciRepo=&evaluate=true&fileSize=false&lineWrap=false&presets=latest%2Creact%2Cstage-2&prettier=false&targets=&version=6.26.0&envVersion=

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