The Writer is not a concrete class. Any object that implements write(), end(), and abort() can be a writer making it easy to adapt existing APIs or create specialized implementations without subclassing. There's no complex UnderlyingSink protocol with start(), write(), close(), and abort() callbacks that must coordinate through a controller whose lifecycle and state are independent of the WritableStream it is bound to.
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，详情可参考同城约会
供给也能创造需求。比如，有的地方将优惠券融入“票根经济”，进一步延伸消费链条。能否让消费券发挥乘数效应，从“初次消费”衍生出“二次消费”“多次消费”，关键就在于不同消费场景之间的融合互动能否真正打动消费者。就此而言，在场景创新上发力，在“吃住行游购娱”全链条上做文章，供需才能更好实现动态平衡，适配度才会更高。，这一点在Line官方版本下载中也有详细论述
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