JS字符串去除连续或全部重复字符的实例

  var s = "1122333455";     var s1 = s;     var c;     var cc = s.match(/(/d)/1+/g);    //11,22,333,55 当然这里用()/1*也会可以(因为下面是替换):11,22,333,4,55     for(var i = 0;i<cc.length;i++){         c = cc[i].substring(0,1);         s1 = s1.replace(cc[i],c);    }    alert(s1);   //12345

     var s = "1234321abaccc";     var s1 = s.split("").sort().join("");     var cc = s1.match(/(.)/1+/g);    //11,22,33,aa,ccc 当然这里用()/1*也会可以(因为下面是替换):11,22,33,4,aa,b,ccc     for(var i = 0;i<cc.length;i++){         c = cc[i].substring(0,1);         s1 = s1.replace(cc[i],c);     }    alert(s1);    //1234abc

function repeat(str , n){return new Array(n+1).join(str);}console:repeat("a", 3); //aaa

var sa="ABCD";var newStr=Array.prototype.join.call(sa); //A,B,C,DnewStr.split(','); //['A','B','C','D']