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JS小技巧大本事(持续更新)

1. 复制N个字符

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

 

2. 替代if…else…

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

 

 

3. 多条件判断

Maybe:

 

 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 }

 

Better:

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

 

 

 

.Thinking

保证代码可读性,灵活应用JS代码技巧。一方面提升自己的编码能力,一方面加深对JS的理解。