项目原始demo，不改动

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array-find-index

ES2015 Array#findIndex() ponyfill

Install

$ npm install --save array-find-index

const arrayFindIndex = require('array-find-index');

arrayFindIndex(['rainbow', 'unicorn', 'pony'], x => x === 'unicorn');
//=> 1

Same as Array#findIndex(), but with the input array as the first argument.