oInput.onkeyup = function () {
    this.value = this.value.replace(/[^(\d)|(,)]/, "")
    }
    把非 数字和逗号的都替换为空
    oBtn.onclick = function () {
    var sum = 0;
    var oInput = document.getElementsByTagName("input")[0].value.split(",");
    for (var i in oInput)
    {
    sum += parseInt(oInput[i])
    }
    oStrong.innerHTML = sum
    }