项目原始demo，不改动

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unique-slug

Generate a unique character string suitible for use in files and URLs.

var uniqueSlug = require('unique-slug')

var randomSlug = uniqueSlug()
var fileSlug = uniqueSlug('/etc/passwd')

If str is passed in then the return value will be its murmur hash in hex.

If str is not passed in, it will be 4 bytes coverted into 8 hex characters, generated by crypto.pseudoRandomBytes.