var array = [];

function closest(array,num){
    var i=0;
    var minDiff=1000;
    var ans;
    for(i in array){
         var m=Math.abs(num-array[i]);
         if(m<minDiff){ 
                minDiff=m; 
                ans=array[i]; 
            }
      }
    return ans;
}

/*call array name and desired value to be closet */
alert(closest(array,88));