本人最近开始尝试学习vue.js。想使用vue写一个小例子,就选择做验证码按钮倒计时功能。
上网上搜了一下,也把他们的代码试了一下,自己出了很多问题。所以,需要写一篇基础入门的文章,避免后面人采坑。
这是按照网上写的HTML页面
<div class="register-pannel" id ="register-pannel"> <div class="register-l" align="center"> <div class="input-group" style="width: 300px;"> <input type="text" class="form-control" placeholder="邮箱/手机号/用户名" style="height: 40px;" /> <span class="glyphicon glyphicon-user form-control-feedback" aria-hidden="true" /> </div> <br /> <div class="input-group" style="width: 300px;"> <input type="text" class="form-control" placeholder="密码" style="height: 40px;" /> <span class="glyphicon glyphicon-lock form-control-feedback" /> </div> <br /> <div class="input-group" style="width: 300px;"> <input type="text" class="form-control" placeholder="手机号" style="height: 40px;" /> <span class="glyphicon glyphicon-phone form-control-feedback" /> </div> <br /> <div class="input-group" style="width: 300px;"> <span class="register-msg-btn" v-show="show" v-on:click="getCode">发送验证码</span> <span class="register-msg-btn" v-show="!show">{{count}} s</span> <input type="text" class="form-control" placeholder="验证码" style="float: right; height: 40px; width: 150px;" /> <span class="glyphicon glyphicon-font form-control-feedback" /> </div> <br /> <span class="btn-register">注册</span> </div>
js写成
<script> <span style="white-space: pre;"> </span>data(){ <span style="white-space: pre;"> </span>return { <span style="white-space: pre;"> </span>show: true, <span style="white-space: pre;"> </span>count: '', <span style="white-space: pre;"> </span>timer: null, <span style="white-space: pre;"> </span>} <span style="white-space: pre;"> </span>}, <span style="white-space: pre;"> </span>methods:{ <span style="white-space: pre;"> </span>getCode(){ <span style="white-space: pre;"> </span>const TIME_COUNT = 60; <span style="white-space: pre;"> </span>if (!this.timer) { <span style="white-space: pre;"> </span>this.count = TIME_COUNT; <span style="white-space: pre;"> </span>this.show = false; <span style="white-space: pre;"> </span>this.timer = setInterval(() => { <span style="white-space: pre;"> </span>if (this.count > 0 && this.count <= TIME_COUNT) { <span style="white-space: pre;"> </span>this.count--; <span style="white-space: pre;"> </span>} else { <span style="white-space: pre;"> </span>this.show = true; <span style="white-space: pre;"> </span>clearInterval(this.timer); <span style="white-space: pre;"> </span>this.timer = null; <span style="white-space: pre;"> </span>} <span style="white-space: pre;"> </span>}, 1000) <span style="white-space: pre;"> </span>} <span style="white-space: pre;"> </span>} <span style="white-space: pre;"> </span>} </script>
发现浏览器一直报错Uncaught SyntaxError: Unexpected token {
所以按照官方文档的格式,把js的结构改成
<script> new Vue({ el:'.register-pannel', data:{ show:true, timer:null, count:'' }, methods:{ getCode(){ this.show = false; const TIME_COUNT = 60; if (!this.timer) { this.count = TIME_COUNT; this.show = false; this.timer = setInterval(() => { if (this.count > 0 && this.count <= TIME_COUNT) { this.count--; } else { this.show = true; clearInterval(this.timer); this.timer = null; } }, 1000) } } } }); </script>
于是格式是没有问题了,但是样式并没有生效。变成了另一个样子。
上网上搜了很多。
有说是js引用顺序的问题。
有说是将js写进window.onload
的。试了一下,发现都不对。
后来,在官方文档中发现了el属性:为实例提供挂载元素。值可以是 CSS 选择符,或实际 HTML 元素,或返回 HTML 元素的函数。
所以改成
<script> new Vue({ el:'.register-pannel', //注册div的class data:{ show:true, timer:null, count:'' }, methods:{ getCode(){ this.show = false; const TIME_COUNT = 60; if (!this.timer) { this.count = TIME_COUNT; this.show = false; this.timer = setInterval(() => { if (this.count > 0 && this.count <= TIME_COUNT) { this.count--; } else { this.show = true; clearInterval(this.timer); this.timer = null; } }, 1000) } } } }); </script>
效果就出来了。
总结
以上所述是小编给大家介绍vue实现验证码按钮倒计时功能,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对网站的支持!