写入左括号。
Every left parenthesis in a string is matched by a right parenthesis.
字符串的左括号都有相应的右括号。
A blank space should not be used between a function value and its left parenthesis.
函数参数与左括号之间不应该有空格。
If a function literal is anonymous, there should be one space between the word function and the left parenthesis.
如果函数是匿名函数，则在function和左括号之间应有一个空格。
If a function literal is anonymous, there should be one space between the word function and the left parenthesis.
如果函数是匿名函数，则在function和左括号之间应有一个空格。
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