JAVASCRIPT-最简易分页功能

小练习 oooo

<script>
        var arr = [];
        var num = 3;
        arr[2] = num;
        arr[1] = num - 1;
        arr[0] = num - 2;
        arr[3] = num + 1;
        arr[4] = num + 2;
        // console.log(arr);
        for (var s of arr) {
            var i = document.createElement("i");
            i.innerHTML = s;
            document.body.appendChild(i);
        }
        var is = document.querySelectorAll("i");
        for (var j = 0; j < arr.length; j++) {
            is[j].index = j;
            is[j].onclick =  function(){
                if (arr[this.index] >= 3 ) {
                    num = arr[this.index];
                    arr[2] = num;
                    arr[1] = num - 1;
                    arr[0] = num - 2;
                    arr[3] = num + 1;
                    arr[4] = num + 2;
                    is = document.querySelectorAll("i");
                    for(var s = 0;s<is.length;s++){
                        is[s].innerHTML=arr[s];
                    }
                }
        }
    }
    </script>