1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 <meta charset="UTF-8"> 5 <title>去重</title> 6 </head> 7 <body> 8 <script type="text/javascript"> 9 /*数组去重*/ 10 function quchong(arr){ 11 var len = arr.length; 12 arr.sort(); 13 for(var i=len-1;i>0;i--){ 14 if(arr[i]==arr[i-1]){ 15 arr.splice(i,1); 16 } 17 } 18 return arr; 19 } 20 var a = ["a","a","b",'b','c','c','a','d']; 21 var b = quchong(a); 22 console.log(b); 23 /*字符串去重*/ 24 function quchongstr(str){ 25 var a = str.match(/S+/g);//等价于str.split(/s+/g)// s空白符，S非空白符 26 a.sort(); 27 for(var i=a.length-1;i>0;i--){ 28 if(a[i]==a[i-1]){ 29 a.splice(i,1); 30 } 31 } 32 return a.join(" "); 33 } 34 var str = quchongstr("a a b a b e"); 35 console.log(str); 36 37 </script> 38 </body> 39 </html>