关于按钮触发js特效后台无法执行

Question

document.getElementById("yan").onclick=function(){time(this);} 这句让你不会去执行后台方法可以这样写
OnClientClick="time()" OnClick="yan_onClick" 

Answer 1

服务器端的空间ID在生成HTML标签时ID可能不是“yan”，你查看下源代码

Answer 2

<script type="text/javascript">
                var wait=45;
                document.getElementById("yan").disabled = false;   
                function time(o) {
                        if (wait == 0) {
                            o.removeAttribute("disabled");           
                            o.value="获取验证码";
                            wait = 5;
                        } else {
                            o.setAttribute("disabled", true);
                            o.value="重新发送(" + wait + ")";
                            wait--;
                            setTimeout(function() {
                                time(o)
                            },
                            1000)
                        }
                    }
                onclick=function(){time(this);}
                </script> js这样写么？这样好像是执行了后台的方法。不过没倒计时的效果了？

Answer 3

<script type="text/javascript">
                var wait=45;
                document.getElementById("yan").disabled = false;   
                function time(o) {
                        if (wait == 0) {
                            o.removeAttribute("disabled");           
                            o.value="获取验证码";
                            wait = 5;
                        } else {
                            o.setAttribute("disabled", true);
                            o.value="重新发送(" + wait + ")";
                            wait--;
                            setTimeout(function() {
                                time(o)
                            },
                            1000)
                        }
                    }
                onclick=function(){time(this);}
                </script> js这样写么？这样好像是执行了后台的方法。不过没倒计时的效果了？我的意思是这样：
 <script type="text/javascript">
                var wait=45;
                document.getElementById("yan").disabled = false;   
                function time(o) {
                        if (wait == 0) {
                            o.removeAttribute("disabled");           
                            o.value="免费获取验证码";
                            wait = 5;
                        } else {
                            o.setAttribute("disabled", true);
                            o.value="重新发送(" + wait + ")";
                            wait--;
                            setTimeout(function() {
                                time(o)
                            },
                            1000)
                        }
                    }
           
                </script> <asp:Button runat=server CssClass="enter" Text="获取验证码" ID="yan" name="yan"  OnClientClick="time(this)" OnClick="yan_onClick" style="width:40%;" />
               
tiem(this)  这个this 是传的button  不知道你想传什么。 可以自己改下

Answer 4

也是学习了一番   这个或许对你有帮助  正解   http://bbs.csdn.net/topics/390438427