源代碼：letpromise=newPromise(function(resolve,reject){setTimeout(()=>{resolve()},1000)})Array.from(newSet([1,2,3,2,1]));[1,2,NaN,3,4].findIndex(isNaN);先用下面的.babelrc{"presets":[["@babel/env",{"targets":{"chrome":"58","ie":"10"},"useBuiltIns":"usage",}]],"plugins":[]}生成下面代碼"usestrict";require("core-js/modules/es6.array.find-index");require("core-js/modules/web.dom.iterable");require("core-js/modules/es6.array.iterator");require("core-js/modules/es6.set");require("core-js/modules/es6.string.iterator");require("core-js/modules/es6.array.from");require("core-js/modules/es6.promise");require("core-js/modules/es6.object.to-string");varpromise=newPromise(function(resolve,reject){setTimeout(function(){resolve();},1000);});Array.from(newSet([1,2,3,2,1]));[1,2,NaN,3,4].findIndex(isNaN);然后我在plugins里面加了@babel/plugin-transform-runtime{"presets":[["@babel/env",{"targets":{"chrome":"58","ie":"10"},"useBuiltIns":"usage",}]],"plugins":["@babel/plugin-transform-runtime"]}但是最后生成的代碼還是和之前一模一樣的，這是咋回事呀