JS Small Skills Big Skill (continuous update)

1. Copy n characters

1 function (num) {2     return (new Array (++num)). Join (this); 3 }4  5var a = ' a '; 6 a.repeat (5);  // ' AAAAA '

2. Replace If...else ...

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

3. Multi-Conditional judgment

Maybe:

1 functionYourfun (status) {2     varcolor;3     Switch(status) {4          Case0:5color = ' White ';6              Break;7          Case1:8color = ' Red ';9              Break;Ten          Case2: Onecolor = ' Yellow '; A              Break; -          Case3: -color = ' green '; the              Break; -          Case4: -color = ' Blue '; -              Break; +     } -  +     returncolor; A}

Better:

1 function Yourfun (status) {2     return [' White ', ' red ', ' yellow ', ' green ', ' Blue '][status] 3 }

. Thinking

Ensure code readability, flexible application of JS code skills. On the one hand to improve their coding ability, on the one hand to deepen the understanding of JS.