Read the "JavaScript language essence" note

First, some write code considerations

Use of 1.parseInt

Because in octal, 8 and 9 are not numbers, so

Generates 0 as a result, which causes the program parsing time and date to appear incorrectly. Therefore, it is recommended to use parseint to pass 10.

The result of parseint ("08", 10) is 8

2. When using the for in loop, it is best to add

 for inch obj) {  if  (Obj.hasownproperty (MyVar)) {

}

}

To rule out the properties from the prototype chain.

3. How to determine whether a value is a number

var isnumber = function Isnumber (value) {  return typeof value = = = ' Number ' && isfinite (value);} 

4. Use
　　

If (ok) {  t = true;  } 

Replace

if (OK) T = true;

5. Use

var foo = function foo () {};

Replace

　　

function foo () {};

6. In addition to the for function if switch try while, All statements are followed by a semicolon.

7. Do not exceed 100 words per line of code, beyond the line to be wrapped. Line breaks after punctuation and operators.

8. Use + = 1-=1 instead of + +--

　

Read the "JavaScript language essence" note