js实现多个字符串首尾重复拼接

var j=0;
var isRepeat = null
var index = null

var res = new Array()
var tmp_key2
var tmp_key1 
var Repeat = function(ary) {

 var arr1 = tmp = ary;
 for(var i=0; i<ary.length; i++){

 tmp_key1 = ary[i];
 var len1 = tmp_key1.length;
 ccc:
 for(j = 0 ; j<arr1.length; j++){
 if(i===j){
 continue;
 }

 tmp_key2 = arr1[j];
 var len2 = tmp_key2.length;


 index = -1;
 var index_num =0;

 for(var k = 0; k < len2; k++) {

 var tmp_str = tmp_key2.slice(0,k+1);


 index = tmp_key1.indexOf(tmp_str);

 if(index !== -1){
 isRepeat = index;
 } 
 if( isRepeat != null && index ===-1 ){

 break ccc;
 }

 }



 }
 // console.log(isRepeat);

 if(isRepeat !== null) { 

 res.push(tmp_key1.slice(0,isRepeat)+tmp_key2)

 } 
 index = null;
 isRepeat = null;
 }
 console.log(res);
 return res;
}

var ary = new Array("中国红","红红火火","zhanglei","lei@silenc","kkkzhang");
Repeat(ary);

["中国红红火火", "zhanglei@silenc", "kkkzhanglei"]