Listing 4 shows a typical messaging event, posting notification of a new high bid in an auction system, and the code that generates it.

清单4显示了一个典型的消息传递事件，即发布拍卖系统中的一个新的高投标通知和产生该事件的代码。

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Now, try it out by adding a new listing.

现在，通过添加一个新的清单试试效果。

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To see this in action, try creating a new listing and entering a minimum price that is higher than the maximum price.

要看到该验证器的实际运行效果，尝试创建一个新的清单，并输入一个大于最高价格的最低价格。

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This brand-new listing now ranks as one of the most expensive for-sale homes in America.

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It could face higher advertising costs in the future as Google ( GOOG) discontinued its free product listing service effective in the fall of 2012, replacing it with a new fee-based listing service.

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The most hotly-anticipated new listing remains Facebook, as investors wait for a filing from the social network that is anticipated to make its public debut in 2012.

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