JavaScript的数组和字符串应用详解编程语言

 1 //方法一 
 2         var search = function(arr,dst){ 
 3             var idx = arr.indexOf(dst); 
 4             return idx; 
 5         }; 
 6         var arr = [1, 2, 4, 6, 7, 9, 19,20, 30, 40, 45, 47]; 
 7         var idx = search(arr,45); 
 8         console.log(idx); 
 9  
10  
11         //方法二 
12         var search = function(arr,dst){ 
13              
14             for (var i = arr.length - 1; i >= 0; i--) { 
15                 if (arr[i] === dst) { 
16                     return i; 
17                 } 
18             } 
19         }; 
20         var arr = [1, 2, 4, 6, 7, 9, 19,20, 30, 40, 45, 47]; 
21         var idx = search(arr,45); 
22         console.log(idx); 
23  
24         //方法三 二分法 
25         var search = function(arr,dst,left,right){ 
26             var mid = Math.floor((left+right)/2); 
27             var midval = arr[mid]; 
28             if (dst > midval) { 
29                 search(arr,dst,mid,right); 
30             } 
31             else if (dst < midval) { 
32                 search(arr,dst,left,mid); 
33             } 
34             else{ 
35                 console.log(mid); 
36                 return mid; 
37             } 
38         } 
39         var arr = [1, 2, 4, 6, 7, 9, 19,20, 30, 40, 45, 47]; 
40         var idx = search(arr,45,0,arr.length-1); 
41         console.log(idx);

 1 var toCamelStyle = function(str){ 
 2             var nstr = str.split("-"); 
 3             var mystr = ""; 
 4             for (var i = 0; i < nstr.length; i++) { 
 5                 if (i === 0) { 
 6                     mystr = mystr + nstr[i]; 
 7                 }else{ 
 8                     mystr = mystr + nstr[i].substring(0,1).toUpperCase()+nstr[i].substring(1); 
 9                 } 
10             } 
11             return mystr; 
12         } 
13         var str = "aa-bb-cc"; 
14         var mystr = toCamelStyle(str); 
15         console.log(mystr);