ERROR in static/js/xxx.js from UglifyJs Unexpected token name «currentVersion»

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ERROR in static/js/xxx.js from UglifyJs
Unexpected token name «currentVersion», expected punc

	遇到这种异常, 需要运行下面脚本
	运行npm i -D uglifyjs-webpack-plugin@beta
	修改webpack.prod.conf.js
	
	js中引入参数
	const UglifyJsPlugin = require('uglifyjs-webpack-plugin')

	再将原来的
	 new webpack.optimize.UglifyJsPlugin ({
	      compress: {
	        warnings: false
	      },
	      sourceMap: config.build.productionSourceMap,
	      parallel: true
	    }), 
	改成
	new UglifyJsPlugin(),

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