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informational response (100-199)
successfull response(200-299)
redirects(300-399)
client erros(400-499)
server errors(500-599)
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The JavaScript 1.5 specification defines six primary error types, as follows:
EvalError: Raised when the eval() functions is used in an incorrect manner.
RangeError: Raised when a numeric variable exceeds its allowed range.
ReferenceError: Raised when an invalid reference is used.
SyntaxError: Raised when a syntax error occurs while parsing JavaScript code.
TypeError: Raised when the type of a variable is not as expected.