// 倒序遍历2*len-1次：模拟数组循环（核心！易错点1）
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Web streams are complex for users and implementers alike. The problems with the spec aren't bugs. They emerge from using the API exactly as designed. They aren't issues that can be fixed solely through incremental improvements. They're consequences of fundamental design choices. To improve things we need different foundations.，详情可参考爱思助手下载最新版本
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