Reason analysis and resolution of parseint ("08") and "09" in JavaScript return 0

Today in the program appeared a bugger, debugging for a long time, finally found that the original is the problem.

An experiment was done:

Alert (parseint ("01")), when this value is 01==== "07 o'clock is normal, but in" 08 "," 09 "will return 0

(This behavior occurs in the IE kernel browser, such as the 360 browser will appear this error) (Google, Firefox is not affected)
。

Access to information on the causes of this phenomenon:

Explanation of the Great God:

01--07 naturally no problem, but the 09,08 are unqualified octal form, so was treated according to 0. To solve this problem, you can use another parameter of the parseint function to show that the parseint is handled in decimal.

parseint ("08", 10) or parseint ("09", 10)

The role of parseint (string,radix) is to convert a string to an integer, the second parameter is the format of string, commonly used is 2, 8, 10, 16, which indicates how many binary strings are.

Radix the range of desirable values is 2~36, and if not within this range, Nan will be returned.

If you set the value of radix to 0 or if you do not set it, the format of the string is automatically recognized:

Starting with "0x", parseint () treats the remainder of string except 0x as a hexadecimal number,

Starting with "0", parseint () treats characters except 0 as octal or hexadecimal digits.

Starting with a number from 1 to 9, parseint () treats it as a decimal number.

The above is a small series to introduce you to the JavaScript parseint ("08") and "09" return 0 of the reasons for analysis and the relevant knowledge of the solution, I hope to help you, if you have any questions please give me a message, small series will promptly reply to you. Thank you very much for your support of the IT factory website!

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Reason analysis and resolution of parseint ("08") and "09" in JavaScript return 0