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[email protected] 里 build/d3-hexjson.min.js 中有 ES6 语法(const)
https://github.com/olihawkins/d3-hexjson/blob/master/build/d3-hexjson.min.js
https://github.com/olihawkins/d3-hexjson/blob/master/build/d3-hexjson.min.js