sorted-diff-stream:给定两个已排序的流，将仅发出不匹配的对

排序差异流 给定两个已排序的流，将仅发出不匹配的对 用法 var diffStream = require（'sorted-diff-stream'） 返回一个可用于创建新差异的函数 有关API示例，请参见test.js 例子 var diffStream = require ( 'sorted-diff-stream' ) var through = require ( 'through2' ) var a = through ( ) var b = through ( ) var diffs = diffStream ( a , b , isEqual , compare ) // this is the default `isEqual`, you dont have to pass one above function isEqual ( a , b , cb ) { cb