npm install multibyte-substr> multibyte substr
``
$ npm install --save multibyte-substr
`js
const multibyteSubstr = require('multibyte-substr');
multibyteSubstr('牛丼', 1 ,2);
//=> '丼'
multibyteSubstr('牛丼', 0 , 4);
//=> '牛丼'
`
#### input
Type: string
#### start
Type: number
##### len
Type: number`
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