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This time I will bring you what to pay attention to when making a verification code button countdown with Vue. The following is a practical case, let’s take a look.
I searched online and tried their code, but I encountered many problems. Therefore, it is necessary to write a basic introductory article to avoid pitfalls for others later.
This is written in js according to the HTML page written on the Internet
<p class="register-pannel" id ="register-pannel"> <p class="register-l" align="center"> <p 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" /> </p> <br /> <p 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" /> </p> <br /> <p 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" /> </p> <br /> <p 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" /> </p> <br /> <span class="btn-register">注册</span> </p>
I found that the browser keeps reporting errors
Uncaught SyntaxError: Unexpected token {
So according to the format of the official document, change the js structure to
<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>
Then the format is no problem, but the style does not take effect. It became something else.
I searched a lot on the Internet.
It is said that it is a problem with the js reference order.
It is said that js is written into
window.onload. I tried it and found that it was all wrong. Later, the el attribute was discovered in the official documentation: providing a mounting element for the instance. The value can be a CSS selector, an actual HTML element, or a function that returns an HTML element.
So change it to
<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>
and the effect will come out.
# I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!
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