今天做登录，要一个验证码的功能，就在网上找了一个例子，里面有一些算法觉得还不错，在这里就把它分享出来，供大家一起学习。先看下效果图 ↓
这里是登录的jsp页面：样式是自己加的，可以更加自己的需要添加样
<div class="rigth">
<form action="">
<div>
<input id="s1" class="i1" placeholder="用户名" type="text" >
</div>
<input id="s2" class="i2" placeholder="密码"type="password" ">
<div id="mpanel2"></div>
<button type="button" id="check-btn" class="verify-btn">登 录</button>
</form>
</div>下面添加的这个js是的登录按钮的控制（也是验证码验证的回调函数）
$('#mpanel2').codeVerify({
type : 1,
width : '400px',
height : '50px',
fontSize : '30px',
codeLength : 4,//这是验证码的长度，可以根据自己的需求改
btnId : 'check-btn',
ready : function() {
},
success : function() {
alert('验证匹配！');
},
error : function() {
alert('验证码不匹配！');
}
});这个js就是对验证码的生成及样式，位子的算法（有点长就分析一下核心的代码，下面我把例子源码通过百度云盘分享给大家，建议大家把源码过一遍，好多样式及标签都是通过动态生成的，源码弄懂了，自己想怎么改都行）
;(function($, window, document,undefined) {
//定义Code的构造函数
var Code = function(ele, opt) {
this.$element = ele,
this.defaults = {
type : 1,
figure : 100, //位数，仅在type=2时生效
arith : 0, //算法，支持加减乘，0为随机，仅在type=2时生效
width : '200px',
height : '60px',
fontSize : '30px',
codeLength : 6,
btnId : 'check-btn',
ready : function(){},
success : function(){},
error : function(){}
},
this.options = $.extend({}, this.defaults, opt)
};
//验证码数字，如果你的只是数字或者，字母的话就改一下就行
var _code_chars = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'];
//背景颜色
var _code_color1 = [' #00748B', ' #00748B', ' #00748B', ' #00748B'];
//生成字体的颜色
var _code_color2 = ['#FFFFFF', '#FFFFFF', '#FFFFFF', '#FFFFFF', '#FFFFFF', '#FFFFFF'];
//加载页面
loadDom : function() {
var panelHtml = '<div class="cerify-code-panel" ><div class="verify-code"></div><div class="verify-code-area"><div class="verify-input-area"><input placeholder=" 验证码" type="text" id="s3" class="varify-input-code" onfocus="txtfocus(this)" onBlur="txtblur(this)"/></div><a class="verify-change-code">换一张</a></div></div>';
this.$element.append(panelHtml);
this.htmlDoms = {
code_btn : $('#'+this.options.btnId),
code : this.$element.find('.verify-code'),
code_area : this.$element.find('.verify-code-area'),
code_input : this.$element.find('.varify-input-code'),
};
},
//设置验证码
setCode : function() {
var color1Num = Math.floor(Math.random() * 3);
var color2Num = Math.floor(Math.random() * 5);
this.htmlDoms.code.css({'background-color': _code_color1[color1Num], 'color': _code_color2[color2Num]});
this.htmlDoms.code_input.val('');
var code = '';
this.code_chose = '';
if(this.options.type == 1) { //普通验证码
for(var i = 0; i < this.options.codeLength; i++) {
var charNum = Math.floor(Math.random() * 52);
var tmpStyle = (charNum%2 ==0)? "font-style:italic;margin-right: 10px;":"font-weight:bolder;";
tmpStyle += (Math.floor(Math.random() * 2) == 1)? "font-weight:bolder;":"";
this.code_chose += _code_chars[charNum];
code += '<font style="'+tmpStyle+'">'+_code_chars[charNum]+'</font>';
}
}else { //算法验证码
var num1 = Math.floor(Math.random() * this.options.figure);
var num2 = Math.floor(Math.random() * this.options.figure);
if(this.options.arith == 0) {
var tmparith = Math.floor(Math.random() * 3);
}
switch(tmparith) {
case 1 :
this.code_chose = parseInt(num1) + parseInt(num2);
code = num1 + ' + ' + num2 + ' = ?';
break;
case 2 :
if(parseInt(num1) < parseInt(num2)) {
var tmpnum = num1;
num1 = num2;
num2 = tmpnum;
}
this.code_chose = parseInt(num1) - parseInt(num2);
code = num1 + ' - ' + num2 + ' = ?';
break;
default :
this.code_chose = parseInt(num1) * parseInt(num2);
code = num1 + ' × ' + num2 + ' = ?';
break;
}
}
this.htmlDoms.code.html(code);
},
//比对验证码
checkCode : function() {
if(this.options.type == 1) { //普通验证码
var own_input = this.htmlDoms.code_input.val().toUpperCase();
this.code_chose = this.code_chose.toUpperCase();
}else {
var own_input = this.htmlDoms.code_input.val();
}
if(own_input == this.code_chose) {
this.options.success();
}else {
this.options.error();
this.setCode();
}
}
};
//定义Slide的方法
Slide.prototype = {
init: function() {
var _this = this;
//加载页面
this.loadDom();
this.options.ready();
this.$element[0].onselectstart = document.body.ondrag = function(){
return false;
};
//按下
this.htmlDoms.move_block.on('touchstart', function(e) {
_this.start(e);
});
this.htmlDoms.move_block.on('mousedown', function(e) {
_this.start(e);
});
//拖动
window.addEventListener("touchmove", function(e) {
_this.move(e);
});
window.addEventListener("mousemove", function(e) {
_this.move(e);
});
//鼠标松开
window.addEventListener("touchend", function() {
_this.end();
});
window.addEventListener("mouseup", function() {
_this.end();
});
//刷新
_this.$element.find('.verify-refresh').on('click', function() {
_this.refresh();
});
},
//获取left值
getLeft: function(node) {
var left = $(node).offset().left;
return left;
}
};
//定义Points的构造函数
var Points = function(ele, opt) {
this.$element = ele,
this.defaults = {
defaultNum : 4, //默认的文字数量
checkNum : 3, //校对的文字数量
vSpace : 3, //间隔
imgName : ['1.jpg', '2.jpg'],
imgSize : {
width: '400px',
height: '200px',
},
barSize : {
width : '400px',
height : '40px',
},
ready : function(){},
success : function(){},
error : function(){}
},
this.options = $.extend({}, this.defaults, opt)
};
//定义Points的方法
Points.prototype = {
init : function() {
var _this = this;
//加载页面
_this.loadDom();
_this.refresh();
_this.options.ready();
this.$element[0].onselectstart = document.body.ondrag = function(){
return false;
};
//点击事件比对
_this.$element.find('.verify-img-panel canvas').on('click', function(e) {
_this.checkPosArr.push(_this.getMousePos(this, e));
if(_this.num == _this.options.checkNum) {
_this.num = _this.createPoint(_this.getMousePos(this, e));
setTimeout(function () {
var flag = _this.comparePos(_this.fontPos, _this.checkPosArr);
if(flag == false) { //验证失败
_this.options.error();
_this.$element.find('.verify-bar-area').css({'color': '#d9534f', 'border-color': '#d9534f'});
_this.$element.find('.verify-msg').text('验证失败');
setTimeout(function () {
_this.$element.find('.verify-bar-area').css({'color': '#000','border-color': '#ddd'});
_this.refresh();
}, 400);
}else { //验证成功
_this.$element.find('.verify-bar-area').css({'color': '#4cae4c', 'border-color': '#5cb85c'});
_this.$element.find('.verify-msg').text('验证成功');
_this.$element.find('.verify-refresh').hide();
_this.$element.find('.verify-img-panel').unbind('click');
_this.options.success();
}
}, 400);
}
if(_this.num < _this.options.checkNum) {
_this.num = _this.createPoint(_this.getMousePos(this, e));
}
});
//刷新
_this.$element.find('.verify-refresh').on('click', function() {
_this.refresh();
});
},
//加载页面
loadDom : function() {
this.fontPos = []; //选中的坐标信息
this.checkPosArr = []; //用户点击的坐标
this.num = 1; //点击的记数
this.img_rand = Math.floor(Math.random() * this.options.imgName.length); //随机的背景图片
var panelHtml = '';
var tmpHtml = '';
this.setSize = Slide.prototype.resetSize(this); //重新设置宽度高度
panelHtml += '<div class="verify-img-panel"><div class="verify-refresh" style="z-index:9999"><i class="iconfont icon-refresh"></i></div><canvas width="'+this.setSize.img_width+'" height="'+this.setSize.img_height+'"></canvas></div><div class="verify-bar-area"><span class="verify-msg"></span></div>';
this.$element.append(panelHtml);
this.htmlDoms = {
img_panel : this.$element.find('.verify-img-panel'),
bar_area : this.$element.find('.verify-bar-area'),
msg : this.$element.find('.verify-msg'),
};
this.htmlDoms.img_panel.css({'width': this.setSize.img_width, 'height': this.setSize.img_height, 'background-size' : this.setSize.img_width + ' '+ this.setSize.img_height, 'margin-bottom': this.options.vSpace + 'px'});
this.htmlDoms.bar_area.css({'width': this.options.barSize.width, 'height': this.options.barSize.height, 'line-height':this.options.barSize.height});
},
//绘制合成的图片
drawImg : function(obj, img) {
//准备canvas环境
var canvas = this.$element.find('canvas')[0];
//var canvas=document.getElementById("myCanvas");
var ctx=canvas.getContext("2d");
var fontChars = [];
var avg = Math.floor(parseInt(this.setSize.img_width)/(parseInt(this.options.defaultNum)+1));
var tmp_index = '';
var color2Num = Math.floor(Math.random() * 5);
for(var i = 1; i <= this.options.defaultNum; i++) {
fontChars[i-1] = this.getChars(fontStr, fontChars);
tmp_index = Math.floor(Math.random()*3);
ctx.font = fontSizeArr[tmp_index];
ctx.fillStyle = _code_color2[color2Num];
if(Math.floor(Math.random() * 2) == 1) {
var tmp_y = Math.floor(parseInt(this.setSize.img_height)/2) + tmp_index*20 + 20;
}else {
var tmp_y = Math.floor(parseInt(this.setSize.img_height)/2) - tmp_index*20;
}
ctx.fillText(fontChars[i-1],avg * i, tmp_y);
this.fontPos[i-1] = {'char': fontChars[i-1], 'x': avg * i, 'y': tmp_y};
}
for(var i = 0; i < (this.options.defaultNum-this.options.checkNum); i++) {
this.shuffle(this.fontPos).pop();
}
var msgStr = '';
for(var i = 0; i < this.fontPos.length; i++) {
msgStr += this.fontPos[i].char + ',';
}
this.htmlDoms.msg.text('请顺序点击【' + msgStr.substring(0,msgStr.length-1) + '】');
return this.fontPos;
},
//获取坐标
getMousePos :function(obj, event) {
var e = event || window.event;
var scrollX = document.documentElement.scrollLeft || document.body.scrollLeft;
var scrollY = document.documentElement.scrollTop || document.body.scrollTop;
var x = e.clientX - ($(obj).offset().left - $(window).scrollLeft()-2);
var y = e.clientY - ($(obj).offset().top - $(window).scrollTop()-2);
return {'x': x, 'y': y};
},
//递归去重
getChars : function(fontStr, fontChars) {
var tmp_rand = parseInt(Math.floor(Math.random() * fontStr.length));
if(tmp_rand > 0) {
tmp_rand = tmp_rand - 1;
}
tmp_char = fontStr.charAt(tmp_rand);
if($.inArray(tmp_char, fontChars) == -1) {
return tmp_char;
}else {
return Points.prototype.getChars(fontStr, fontChars);
}
},
//刷新
refresh: function() {
var _this = this;
this.$element.find('.point-area').remove();
this.fontPos = [];
this.checkPosArr = [];
this.num = 1;
this.img_rand = Math.floor(Math.random() * this.options.imgName.length); //随机的背景图片
var img = new Image();
img.src = 'images/'+this.options.imgName[this.img_rand];
// 加载完成开始绘制
$(img).on('load', function(e) {
this.fontPos = _this.drawImg(_this, this);
});
},
};
//在插件中使用codeVerify对象
$.fn.codeVerify = function(options, callbacks) {
var code = new Code(this, options);
code.init();
};
//在插件中使用slideVerify对象
$.fn.slideVerify = function(options, callbacks) {
var slide = new Slide(this, options);
slide.init();
};
//在插件中使用clickVerify对象
$.fn.pointsVerify = function(options, callbacks) {
var points = new Points(this, options);
points.init();
};
})(jQuery, window, document);上面的就是算法的核心代码了
备注（用了ActiveX控件，一定要运行控件，不然的话，验证码不出来）：
百度云盘地址：链接: https://pan.baidu.com/s/1_2_C0V4kbEXzX3Bsxp0VpA 密码: qs58
518
扫一扫
被折叠的 条评论
为什么被折叠?
到【灌水乐园】发言
