Uncaught TypeError: Cannot read property 'crypto' of undefined in object-hash

import { Map } from 'rax-map';

引入rax-map后，项目报错，如下

object_hash.js?b83a:1 Uncaught TypeError: Cannot read property 'crypto' of undefined
at eval (object_hash.js?b83a:1)
at Object.eval (object_hash.js?b83a:1)
at Object.7.buffer (object_hash.js?b83a:1)
at o (object_hash.js?b83a:1)
at eval (object_hash.js?b83a:1)
at Object.eval (object_hash.js?b83a:1)
at Object.5../md5 (object_hash.js?b83a:1)
at o (object_hash.js?b83a:1)
at eval (object_hash.js?b83a:1)
at Object.eval (object_hash.js?b83a:1)

/api/components/markers中依赖了object-hash，但是这个库依赖了node.js的crypto模块，在browser环境跑不起来会报错呀

https://github.com/alibaba/rax-map/blob/dev/0.0.10/api/components/markers/index.js#L12

Start with api/components/markers/index.js at the object-hash dependency referenced in the issue, then reproduce the import in a browser environment. Trace why object-hash accesses Node.js crypto and verify that importing rax-map no longer produces the reported TypeError.

Written by the indexing model from the issue text.