1) Typos- these are the most common errors.
2) Capital letters in the wrong place- As you should know JavaScript is a case sensative programing language so althougt Goo, gooD and GOOD are the same to you JavaScript considers them totaly different.
3) Missing braces { } or parantheses ().
4) ..,And the dreaded design errors- these are just about impossible to spot, they are created when your actual lagic is flawed. Some times the only way to correct these are to re-write the entire script again.
5) Last of all there's the miss-function error on which you have called a function which has not been defined first.
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