使用konva和vue-konva库实现拖拽滑块验证功能

1. 在vue项目中安装konva和vue-konva库

npm install konva vue-konva --save-dev

2. 引入vue-konva库

import vuekonva from ‘vue-konva'；

vue.use(vuekonva)

3. 创建单独的滑块验证组件 captcha.vue，在相应的页面中引入使用即可

<template>
 <v-stage :config="config.stage">
  <v-layer ref="layer">
   <!-- 背景组 -->
   <v-group :config="config.group">
    <v-rect :config="config.rect"></v-rect>
    <v-text :config="config.text"></v-text>
   </v-group>
   <!-- 遮罩层组 -->
   <v-group :config="config.group">
    <v-rect :config="config.coverrect" ref="coverrect"></v-rect>
    <v-text :config="config.covertext" v-if="success" ref="covertext"></v-text>
   </v-group>
   <!-- 滑块组 -->
   <v-group :config="config.movegroup" ref="movegroup" @mouseover="movegroupmouseover" @mouseout="movegroupmouseout" @mousedown="movegroupmousedown" @mouseup="movegroupstop">
    <v-rect :config="config.moverect" ref="moverect"></v-rect>
    <!-- 验证成功组 -->
    <v-group :config="config.group" v-if="success">
     <v-circle :config="config.succcircle" ref="succcircle"></v-circle>
     <v-line :config="config.succline"></v-line>
    </v-group>
    <v-group :config="config.movegroup_l" v-else>
     <v-line :config="config.moveline1"></v-line>
     <v-line :config="config.moveline2"></v-line>
    </v-group>
   </v-group>
  </v-layer>
 </v-stage>
</template>
<script>
/*
 * captchaconfig // 属性 {width：330, height: 36} 组件的宽高
 * eventcaptcha  // 验证成功的回调
 */
let _$mousedown = false; // 鼠标是否在滑块组中按下，因为和html没有绑定，所以没有放在data中，并以_$开头
export default {
 props: {
  captchaconfig: {
   type: object,
   default: () => ({
    width: 330, // 宽度
    height: 36, // 高度
   }),
  },
 },
 data() {
  const { width, height } = this.captchaconfig;
  let config = {
   stage: {
    width: width,
    height: height,
   },
   group: {
    x: 0,
    y: 0,
   },
   rect: {
    width: width,
    height: height,
    fill: '#e8e8e8',
   },
   text: {
    x: 0,
    y: 0,
    width: width,
    height: height,
    text: '请按住滑块，拖动到最右边',
    fontsize: 14,
    fontfamily: '微软雅黑',
    align: 'center',
    lineheight: parsefloat(height / 14),
   },
   //滑块组
   movegroup: {
    draggable: true,
   },
   moverect: {
    x: 0.5,
    y: 0.5,
    width: height - 1,
    height: height - 1,
    fill: '#fff',
    stroke: '#8d92a1',
    strokewidth: 1,
   },
   movegroup_l: {
    x: height / 3,
    y: height / 3,
   },
   moveline1: {
    x: 0,
    y: 0,
    points: [0, 0, height / 6, height / 6, 0, height / 3],
    stroke: '#8d92a1',
    strokewidth: 1,
    linecap: 'round',
    linejoin: 'round',
   },
   moveline2: {
    x: height / 6,
    y: 0,
    points: [0, 0, height / 6, height / 6, 0, height / 3],
    stroke: '#8d92a1',
    strokewidth: 1,
    linecap: 'round',
    linejoin: 'round',
   },
   //创建遮罩层组
   coverrect: {
    width: height / 2,
    height: height,
    fill: '#8d92a1',
    opacity: 0.8,
   },
   covertext: {
    x: 0,
    y: 0,
    width: width - height,
    height: height,
    align: 'center',
    text: '验证成功',
    fontsize: 14,
    fontfamily: '微软雅黑',
    fontstyle: 'bold',
    fill: '#fff',
    lineheight: parsefloat(height / 14),
   },
   //验证成功组
   succcircle: {
    x: height / 2,
    y: height / 2,
    radius: height / 4,
    fill: '#8d92a1',
   },
   succline: {
    points: [height / 2 - height / 4 / 2, height / 2, height / 2 - height / 4 / 8, height / 2 + height / 4 / 2, height / 2 + height / 4 / 2, height / 2 - height / 4 / 2],
    stroke: '#fff',
    strokewidth: 1,
    linecap: 'round',
    linejoin: 'round',
   },
  };
  return {
   config,
   success: 0, // 标记是否验证成功 0 失败 1 成功
  };
 },
 mounted() {
  // 给document绑定鼠标抬起事件
  document.addeventlistener('mouseup', this.movegroupstop);
  // 在组件注销的时候取消绑定
  this.$once('hook:beforedestroy', () => {
   document.removeeventlistener('mouseup', this.movegroupstop);
  });
  // 给滑块组绑定拖拽监听
  this.$refs.movegroup.getnode().dragboundfunc((pos) => {
   const { width, height } = this.captchaconfig;
   let movegroup = this.$refs.movegroup.getnode();
   let moverect = this.$refs.moverect.getnode();
   let coverrect = this.$refs.coverrect.getnode();
 
   let movex = movegroup.getattrs().x ? movegroup.getattrs().x : 0;
   coverrect.width(movex + height / 2);
   if (pos.x >= width - height) {
    if (this.success == 0) {
     this.success = 1;
     this.$emit('eventcaptcha');
    }
    coverrect.opacity(1);
   }
   if (this.success == 0) {
    if (pos.x < 0) {
     return {
      x: 0,
      y: movegroup.getabsoluteposition().y,
     };
    } else if (pos.x > width - height) {
     return {
      x: width - height,
      y: movegroup.getabsoluteposition().y,
     };
    } else {
     return {
      x: pos.x,
      y: movegroup.getabsoluteposition().y,
     };
    }
   } else {
    return {
     x: width - height,
     y: movegroup.getabsoluteposition().y,
    };
   }
  });
 },
 methods: {
  // 鼠标进入滑块组
  movegroupmouseover() {
   document.body.style.cursor = 'pointer';
  },
  // 鼠标移出滑块组
  movegroupmouseout() {
   document.body.style.cursor = 'default';
  },
  // 鼠标按下
  movegroupmousedown() {
   _$mousedown = true; // 只有在滑块组点击鼠标才被视作要点击滑动验证
  },
  // 鼠标抬起
  movegroupstop(e) {
   if (!_$mousedown) return;
   _$mousedown = false;
   document.body.style.cursor = 'default'; // 鼠标恢复指针状态
   if (this.success == 0) {
    this.$refs.movegroup.getnode().to({
     x: 0,
     duration: 0.3,
    });
    this.$refs.coverrect.getnode().to({
     width: this.captchaconfig.height / 2,
     duration: 0.3,
    });
   }
  },
 },
};
</script>

4. 最终效果

简单的滑块验证功能实现，可直接在vue页面中引入使用。konva库：

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