If the value matches the current map contents for the key, the key is removed. Listing 5 shows the equivalent source for this operation.
如果值匹配键的当前映射内容，那么就删除这个键。
This operation expects a string, to be interpreted as a ticker symbol for a stock, and returns a current quote for that stock, a float value.
该操作等待一个字符串，被解释为股票的报价机符号，然后返回当前该股票报价，一个浮点值。
The value attribute shows the current state of the operation.
value属性表示操作的当前状态。
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