angularjs - javascript does not accept 0 before any number -

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this question has answer here:

var value = 05000; var addvalue = 1;

if calculate value + addvalue, it's calculating wrong value 

 var result = value + addvalue;// it's return value 20481

see below image quick watch result

enter image description here

but if give value 5000( without 0 before value), it's calculate correct . why?

putting 0 before number makes octal number literal. interpreted in base 8.

for reason - not put leading zeros before numbers. doesn't intend.

if ran code in strict mode, you'd have gotten error instead:

uncaught syntaxerror: octal literals not allowed in strict mode.


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