事件不要用setAttribute,直接xx.onclick或者attachEvent或者addEventListener来添加                //in1.setAttribute("onclick", "addButton()");
                in1.onclick = addButton;
                in3.setAttribute("type", "button");
                in3.setAttribute("value", "删除");
                //in3.setAttribute("onclick", "deButton(this)");
                in3.onclick = function () { deButton(this) }