非常简单的数字加法计算求和js代码

js代码

<script>
        window.onload = function () {
            var oButton = document.getElementsByTagName('button')[0];
            var oStrong = document.getElementsByTagName('strong')[0];
            var oInput = document.getElementsByTagName('input')[0];

            oButton.onclick = function () {
                var sum = 0;
                var oInput1 = document.getElementsByTagName('input')[0].value.split('+');
                for (var i in oInput1) {
                    sum += parseInt(oInput1[i])
                }
                oStrong.innerHTML = sum;
            }
        }
    </script>