Web_Designer提出了一个问题：javascript i++ vs ++i，或许与您遇到的问题类似。
回答者Guffa给出了该问题的处理方式：
The difference between i++ and ++i is the value of the expression.
The value i++ is the value of i before the increment. The value of ++i is the value of i after the increment.
Example:
var i = 42; alert(i++); // shows 42 alert(i); // shows 43 i = 42; alert(++i); // shows 43 alert(i); // shows 43
The i-- and --i operators works the same way.
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