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Copy codeThe Code is as follows:Function checkIP){Obj = ip;Var exp =/^ (\ d {1, 2} | 1 \ d | 2 [0-4] \ d | 25 [0-5]) \. (\ d {1, 2} | 1 \ d | 2 [0-4] \ d | 25 [0-5]) \. (\ d {1, 2} | 1 \ d | 2 [0-4] \ d | 25 [0-5]) \. (\ d {1, 2} | 1 \ d | 2 [0-4] \ d | 25 [0-5]) $ /;Var reg = obj. match (exp );If (reg = null){Return false; // invalid}Else{Return true; // valid}}Function checkMask (mask){Obj =
The correct and valid mask must meet certain conditions. After the decimal mask is converted into binary, the left part of the mask must be 1 and there must be no 0 in the middle. For example, if you convert 255.255.248.0 to a binary value of 11111111.111111.11111000.00000000, you can see that the values on the left ar
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