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README
Apache-2.0

滑块式验证码

English | 中文


用户通过拖动滑块行为来完成校验,支持PC端及移动端。可以将用户拖动行为的时间、精度,滑动轨迹等信息到服务器,然后进行后台算法验证。

特别介绍

Blazor 版本的滑块验证码 传送门

在线演示

单页面演示:http://longbowenterprise.gitee.io/slidercaptcha/
项目内演示:http://admin.blazor.zone/ (本项目为开源后台管理框架 [BootstrapAdmin])
输入三次错误密码后第四次出现滑块式行为验证码

效果图

输入图片说明 输入图片说明

快速开始

组件依赖 font-awesome

CSS

<link href="./src/slidercaptcha.css">

将引入样式表的 <link> 标签复制并粘贴到 <head> 中,并放在所有其他样式表之前。

JS

<script src="./src/longbow.slidercaptcha.js"></script>

将引入脚本的 <script> 标签复制并粘贴到 <body> 最后面。

用法

添加网页Html元素

<div id="captcha"></div>

API

通过 javascript 初始化控件

<div id="captcha"></div>
<script>
    sliderCaptcha({
        id: 'captcha'
    });
</script>   

Options

可以根据自己需要设置宽度与高度等配置

<div id="captcha"></div>
<script>
    sliderCaptcha({
        id: 'captcha',
        width: 280,
        height: 150,
        sliderL: 42,
        sliderR: 9,
        offset: 5,
        loadingText: '正在加载中...',
        failedText: '再试一次',
        barText: '向右滑动填充拼图',
        repeatIcon: 'fa fa-redo',
        setSrc: function () {
            
        },
        onSuccess: function () {
            
        },
        onFail: function () {

        },
        onRefresh: function () {
        
        }
    });
</script>   
名称 类型 默认值 说明
width integer 280 背景图片宽度
height integer 150 背景图标高度
sliderL integer 42 拼图宽度
sliderR integer 9 拼图突出半径
offset integer 5 验证容错偏差值 默认5个像素偏差即认为验证通过
loadingText string "正在加载中..." 图片加载时显示的文本信息
failedText string "再试一次" 验证失败时显示的文本信息
barText integer "向右滑动填充拼图" 拖动滑块准备拖动时显示的文本信息
repeatIcon string "fa fa-redo" 重新加载图标 需引用 font-awesome
setSrc function "https://picsum.photos/?image=random" 设置图片加载路径
onSuccess function null 验证通过时回调此函数
onFail function null 验证失败时回调此函数
onRefresh function null 点击重新加载图标时回调此函数
localImages function function () { return 'images/Pic' + Math.round(Math.random() * 4) + '.jpg'; } 图床图片加载失败时调用此方法返回本地图片路径
remoteUrl string null 服务器端验证请求地址,请求方式默认为 post 方式
verify function function (arr, url) { return true; } 服务器端验证方法 arr 为客户端拖动滑块轨迹,url 为服务器端请求地址,返回值为布尔值

方法

<div id="captcha"></div>
<script>
    var captcha = sliderCaptcha({
        id: 'captcha'
    });
    captcha.reset();
</script>   
Method Example Description
reset captcha.reset() 重置控件

事件

Issue

请前往 Issue 页面添加问题

服务器端认证

客户端代码示例

1. JavaScript

控件配置信息中有 remoteUrl 和 verify 两个配置项,合理正确的设置这两个配置项即可达到想要的服务器端认证逻辑
remoteUrl 默认值为 null 表示未启用服务器端认证方式,设置请求的 webapi 地址后启用服务器端认证方法
控件默认请求服务器端方法如下,可适当进行更改

verify: function (arr, url) {
    var ret = false;
    $.ajax({
        url: url,
        data: JSON.stringify(arr),
        async: false,
        cache: false,
        type: 'POST',
        contentType: 'application/json',
        dataType: 'json',
        success: function (result) {
            ret = result;
        }
    });
    return ret;
}
参数 类型 默认值 说明
arr array object 客户端拖动滑块轨迹数组
url string remoteUrl 配置项中的 remoteUrl 参数值

完整示例代码

sliderCaptcha({
    id: 'captcha',
    repeatIcon: 'fa fa-redo',
    setSrc: function () {
        return 'https://imgs.blazor.zone/images/Pic' + Math.round(Math.random() * 136) + '.jpg';
    },
    onSuccess: function () {
        window.location.href = 'https://gitee.com/LongbowEnterprise/SliderCaptcha';
    },
    remoteUrl: "api/Captcha"
});

服务器端代码示例

1. NETCore WebApi

/// <summary>
/// 滑块服务器端验证方法
/// </summary>
[Route("api/[controller]")]
[ApiController]
[AllowAnonymous]
public class CaptchaController : ControllerBase
{
    /// <summary>
    /// 服务器端滑块验证方法
    /// </summary>
    /// <returns></returns>
    [HttpPost]
    public bool Post([FromBody]List<int> datas)
    {
        var sum = datas.Sum();
        var avg = sum * 1.0 / datas.Count;
        var stddev = datas.Select(v => Math.Pow(v - avg, 2)).Sum() / datas.Count;
        return stddev != 0;
    }
}

2. JAVA SpringBoot

可能会存在精度问题,采用BigDecimal计算即可

@RestController
@RequestMapping("/sliderCaptcha")
public class SliderCaptchaController {

	@PostMapping("/isVerify")
	public boolean isVerify(List<Integer> datas) {
		int sum = 0;
		for (Integer data : datas) {
			sum += data;
		}
		double avg = sum * 1.0 / datas.size();
		
		double sum2 = 0.0;
		for (Integer data : datas) {
			sum2 += Math.pow(data - avg, 2);
		}
		
		double stddev = sum2 / datas.size();
		return stddev != 0;
	}
	
}

常见问题

服务端验证的返回结果怎么一直都是true

示例代码中演示的是前端提交用户滑动轨迹到服务器端进行了 Y 轴的平方差校验,为零时才返回 false,否则返回 true,为 true 表示 Y 轴有偏移,简单的认为此操作是人为操作,因为人手拖动过程中的抖动 Y 轴理论上是不可能没有偏移的。因此依据此值进行是否是人为拖动滑块。

相关问题

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  3. 提交代码
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简介

滑块验证码,用户通过拖动滑块完成校验,支持PC端及移动端,新增 Blazor 版本的滑块验证码 展开 收起
JavaScript 等 4 种语言
Apache-2.0
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