分配值后面的感叹号:A = B！ C [英] Exclamation mark behind assigned value: A = B ! C

问题描述

我正在阅读公司的javaScript编码，发现了以下内容:

I am reading piece of company javaScript cods and I found the following:

seriesCode = pageRecord.getProperty('seriesCode')!'XXX' 

这是否意味着如果第一个值为NULL，第二个应该放在seriesCode中?

Does this mean that if first value is NULL the second on should be placed in seriesCode?

推荐答案

类似于FreeMarker模板语言，是的，!运算符出现在操作数的右侧时，如果左侧的表达式为默认值是null或对缺失变量的引用.

Looks like FreeMarker template language, and yes, the ! operator, when appears on the right side of an operand gives a default value if the left side expression is null or a reference to a missing variable.

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