通过记录带有一个可变数据的项目和一个搜索字符串的简单测试开始。

Start by recording a simple test with one variable data item, a search string.

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函数随带一个格式化字符串和一个可变数目的参数。

The function takes a format string and a variable number of arguments.

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(一元加号)将改变数字字符串值为数值(之前此操作无影响)。

(unary plus) to convert the value to a number if it is a numeric string (previously it was completely ignored).

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