JS小技巧大本事（持续更新）

1 String.prototype.repeat = function(num){
2     return (new Array(++num)).join(this);
3 }
4  
5 var a = ‘A‘;
6 a.repeat(5);  //‘AAAAA‘

1 var result;
2 
3 result = isTrue ? something : anotherthing;
4 result = something || anotherthing;
5 result = something && anotherthing;

 1 function yourFun(status){
 2     var color;
 3     switch(status){
 4         case 0:
 5             color = ‘white‘;
 6             break;
 7         case 1:
 8             color = ‘red‘;
 9             break;
10         case 2:
11             color = ‘yellow‘;
12             break;
13         case 3:
14             color = ‘green‘;
15             break;
16         case 4:
17             color = ‘blue‘;
18             break;
19     }
20 
21     return color;
22 }

1 function yourFun(status){
2     return [‘white‘, ‘red‘, ‘yellow‘, ‘green‘, ‘blue‘][status]
3 }