... Rescue is not valid 抢救无效 Expression is not valid 表达式无效 Rejected is not valid 拒绝无效 ...
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If the evaluation of the test expression is true and does not result in a dynamic or type error, the element is considered locally valid.
如果测试表达式的计算结果为true并且没有导致动态的或类型错误，那么则认为元素在逻辑上是有效的。
If the expression can be parsed but not evaluated, an object is returned but does not contain a valid value.
如果表达式可以进行分析但无法计算，则将返回不包含有效值的对象。
The expression to the left of the equals sign is not a valid target for an assignment.
等号左边的表达式，对于赋值，并不是一个有效目标。
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