JavaScript Coding style __ajax

JS Coding Style

1, all lines of code end with semicolons. Although JS does allow line breaks to end.

2, using an if or a for statement, you must use {}. Instant only one sentence.

3, unlike other programming languages, JS, block {} is not scoped as a variable. JS only supports function-level scopes (var definition), or global scope (undefined, or var defined outside the function).

Therefore, only allow function,if,switch,while,for,do,try statements in JS block {}, other places using block {}, will be an error.

4,var can only be used once, and must be declared before use.

The statement after the 5,return,break,continue,throw statement is an unreachable statement. Should be followed by} end.

The unreachable statements in JS may also be executed.

For example, after a form submission is executed, subsequent statements can also be executed.