if (sum<47){//ignore small error
        //if time sum is less than 47,since we want a 50ms-per animation

                    // we wait to count the sum to more than the number
            console.log("still wating: ",sum)
        }
        else{
                    //here the sum is bigger what we want,so make the UI change
            console.log("------------runing: ",sum)
                sum=0 //reset the sum to caculate the next diff
                if(cur < 100)
                {

                    p.style.width=++cur+"px"

                }
                else{

                    clearInterval(temp)

                }
            }