<button onclick="javascript:window.location.href='ShoppingCarServlet?opt=2&&id=<%=shopCar.getId()%>'" class= "delete" >-</button>
<input value="<%=shopCar.getCount() %>" type="text" id="buynum" name="buynum">
<button onclick="javascript:window.location.href='ShoppingCarServlet?opt=4&&id=<%=shopCar.getId()%>'" class= "Add" >+</button>
<input value="<%=shopCar.getCount() %>" type="text" id="buynum" name="buynum">
<button onclick="javascript:window.location.href='ShoppingCarServlet?opt=4&&id=<%=shopCar.getId()%>'" class= "Add" >+</button>
如果正确:
第二步: 检查看看浏览器是否禁用Javascript脚本,如果禁用了是无法执行的。