Example of a problem when using the parseInt function in javascript

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When using javascript's parseInt function, parseInt ("08") or parseInt ("09") actually returns 0, while parseInt ("01"). ParseInt ("07") is correct at first, which is difficult to understand at first, but later found that the reason for this problem is that when there is a "0" in front of it, the debugger of javascript will think it is an octal number, while "08" and "09" are not legal octal numbers, so it leads to the problem. But parseFloat will not have this problem.

In fact, the parseInt method has an optional parameter to represent the numeric base, so this should not be considered a bug, but we don't usually notice this kind of detail. The solution is simple: use parseInt ("08", 10) or parseInt ("09", 10) and tell the javascript interpreter to use decimal parsing.

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