Vue框架中如何实现手势签名功能？
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本文共计682个文字，预计阅读时间需要3分钟。
原文：本文实例为大家分享了基于Vue实现手势签名的具体代码，供大家参考。具体内容如下：+ 弊端不多说，直接上效果图+ 源码+ 1. template+ template main class=hand-sign-page+ header class=si
改写后：以下为Vue实现手势签名功能的示例代码，供参考。详细内容请看：+ 无需赘述，直接展示效果+ 源码+ 1. 模板内容+
本文实例为大家分享了基于Vue实现手势签名的具体代码，供大家参考，具体内容如下
废话不多说，直接上效果图&源码
代码如下
1. template
<template> <main class="hand-sign-page"> <header class="sign-head">请在下方区域内签名</header> <div id="signContain" :style="{'--back': background}"></div> <footer class="sign-foot"> <button @click="clearCanvas">清除</button> <button @click="saveCanvas">保存</button> </footer> <img v-show="vaildSign" class="sign-img" :src="vaildSign" alt=" "/> </main> </template>
2. js
<script> export default { name: "hand-sign", data() { return { domEl: null,//绘制canvas的父级div canvas: null,//画布 cxt: null,//绘画环境 linewidth:1,//线条粗细，选填 color:"black",//线条颜色，选填 background:"aliceblue",//线条背景，选填 vaildSign: null } }, mounted() { this.initCanvas(); }, methods: { initCanvas() { this.domEl = document.getElementById("signContain"); this.canvas = document.createElement("canvas"); this.domEl.appendChild(this.canvas); this.cxt = this.canvas.getContext("2d"); this.canvas.width = this.domEl.clientWidth; this.canvas.height = this.domEl.clientHeight; this.cxt.fillStyle = this.background; this.cxt.fillRect(0, 0, this.canvas.width, this.canvas.height); this.cxt.strokeStyle = this.color; this.cxt.lineWidth = this.linewidth; //this.cxt.lineCap = "round"; this.clearCanvas();//先清理下 //开始绘制 this.canvas.addEventListener("touchstart", (e) => { this.cxt.beginPath(); this.cxt.moveTo(e.changedTouches[0].pageX - e.target.offsetLeft, e.changedTouches[0].pageY - e.target.offsetTop); }, false); //绘制中 this.canvas.addEventListener("touchmove", (e)=> { this.cxt.lineTo(e.changedTouches[0].pageX - e.target.offsetLeft, e.changedTouches[0].pageY - e.target.offsetTop); this.cxt.stroke(); }, false); //结束绘制 this.canvas.addEventListener("touchend", (e)=> { this.cxt.closePath(); }, false); }, //清除画布 clearCanvas() { this.cxt.clearRect(0, 0, this.canvas.width, this.canvas.height); }, //保存画布 saveCanvas() { console.log(this.blankCanvas());//检查画布是否为空白 if(this.blankCanvas()) { window.alert('请签名'); }else { this.vaildSign = this.canvas.toDataURL(); } }, //canvas非空验证 blankCanvas() { let blank = document.createElement('canvas');//系统获取一个空canvas对象 blank.width = this.canvas.width; blank.height = this.canvas.height; return this.canvas.toDataURL() == blank.toDataURL();//比较值相等则为空 }, } } </script>
3. css
<style lang="less" scoped> .hw(@h, @w: @h) { height: @h; width: @w } .hand-sign-page{ background-color: #fff; .sign-head { text-align: center; padding: 10px; border-bottom: 1px solid #ebebeb; color: #666; font-size: 14px; } #signContain { .hw(400px, 100%); background-color: var(--back); } .sign-foot{ display: flex; justify-content: center; margin: 15px; button { margin: 0 15px; padding: 10px 20px; background-color: #ddd; border-radius: 5px; &:active { background-color: #efefef; } } } .sign-img { .hw(100px, 200px); display: block; margin: 10px auto; } } </style>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持易盾网络。
本文共计682个文字，预计阅读时间需要3分钟。
原文：本文实例为大家分享了基于Vue实现手势签名的具体代码，供大家参考。具体内容如下：+ 弊端不多说，直接上效果图+ 源码+ 1. template+ template main class=hand-sign-page+ header class=si
改写后：以下为Vue实现手势签名功能的示例代码，供参考。详细内容请看：+ 无需赘述，直接展示效果+ 源码+ 1. 模板内容+
本文实例为大家分享了基于Vue实现手势签名的具体代码，供大家参考，具体内容如下
废话不多说，直接上效果图&源码
代码如下
1. template
<template> <main class="hand-sign-page"> <header class="sign-head">请在下方区域内签名</header> <div id="signContain" :style="{'--back': background}"></div> <footer class="sign-foot"> <button @click="clearCanvas">清除</button> <button @click="saveCanvas">保存</button> </footer> <img v-show="vaildSign" class="sign-img" :src="vaildSign" alt=" "/> </main> </template>
2. js
<script> export default { name: "hand-sign", data() { return { domEl: null,//绘制canvas的父级div canvas: null,//画布 cxt: null,//绘画环境 linewidth:1,//线条粗细，选填 color:"black",//线条颜色，选填 background:"aliceblue",//线条背景，选填 vaildSign: null } }, mounted() { this.initCanvas(); }, methods: { initCanvas() { this.domEl = document.getElementById("signContain"); this.canvas = document.createElement("canvas"); this.domEl.appendChild(this.canvas); this.cxt = this.canvas.getContext("2d"); this.canvas.width = this.domEl.clientWidth; this.canvas.height = this.domEl.clientHeight; this.cxt.fillStyle = this.background; this.cxt.fillRect(0, 0, this.canvas.width, this.canvas.height); this.cxt.strokeStyle = this.color; this.cxt.lineWidth = this.linewidth; //this.cxt.lineCap = "round"; this.clearCanvas();//先清理下 //开始绘制 this.canvas.addEventListener("touchstart", (e) => { this.cxt.beginPath(); this.cxt.moveTo(e.changedTouches[0].pageX - e.target.offsetLeft, e.changedTouches[0].pageY - e.target.offsetTop); }, false); //绘制中 this.canvas.addEventListener("touchmove", (e)=> { this.cxt.lineTo(e.changedTouches[0].pageX - e.target.offsetLeft, e.changedTouches[0].pageY - e.target.offsetTop); this.cxt.stroke(); }, false); //结束绘制 this.canvas.addEventListener("touchend", (e)=> { this.cxt.closePath(); }, false); }, //清除画布 clearCanvas() { this.cxt.clearRect(0, 0, this.canvas.width, this.canvas.height); }, //保存画布 saveCanvas() { console.log(this.blankCanvas());//检查画布是否为空白 if(this.blankCanvas()) { window.alert('请签名'); }else { this.vaildSign = this.canvas.toDataURL(); } }, //canvas非空验证 blankCanvas() { let blank = document.createElement('canvas');//系统获取一个空canvas对象 blank.width = this.canvas.width; blank.height = this.canvas.height; return this.canvas.toDataURL() == blank.toDataURL();//比较值相等则为空 }, } } </script>
3. css
<style lang="less" scoped> .hw(@h, @w: @h) { height: @h; width: @w } .hand-sign-page{ background-color: #fff; .sign-head { text-align: center; padding: 10px; border-bottom: 1px solid #ebebeb; color: #666; font-size: 14px; } #signContain { .hw(400px, 100%); background-color: var(--back); } .sign-foot{ display: flex; justify-content: center; margin: 15px; button { margin: 0 15px; padding: 10px 20px; background-color: #ddd; border-radius: 5px; &:active { background-color: #efefef; } } } .sign-img { .hw(100px, 200px); display: block; margin: 10px auto; } } </style>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持易盾网络。