function addClass(ele,cName) {

 var arr = ele.className.split(' ').concat(cName.split(" "));

 for(var i=0;i<arr.length;i++){

  for(var k=arr.length-1;k>i;k--){

   (arr[k]==="")&&arr.splice(k,1);

   (arr[i]===arr[k])&&arr.splice(k,1);

  }

 }

 ele.className = arr.join(" ");

}

function removeClass(ele,cName) {

 var arr1 = ele.className.split(' ');

 var arr2 = cName.split(" ");

 for(var i=0;i<arr2.length;i++)for(var j=arr1.length-1;j>=0;j--)(arr2[i]===arr1[j])&&arr1.splice(j,1)

 ele.className = arr1.join(" ")

}