1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
| getGVerify: function(id) {
function GVerify(options) {
//创建一个图形验证码对象，接收options对象为参数
this.options = {
//默认options参数值
id: '', //容器Id
canvasId: 'verifyCanvas', //canvas的ID
width: '100', //默认canvas宽度
height: '30', //默认canvas高度
type: 'blend', //图形验证码默认类型blend:数字字母混合类型、number:纯数字、letter:纯字母
code: ''
}
if (Object.prototype.toString.call(options) == '[object Object]') {
//判断传入参数类型
for (var i in options) {
//根据传入的参数，修改默认参数值
this.options[i] = options[i]
}
} else {
this.options.id = options
}
this.options.numArr = '0,1,2,3,4,5,6,7,8,9'.split(',')
this.options.letterArr = getAllLetter()
this._init()
this.refresh()
}
GVerify.prototype = {
/**版本号**/
version: '1.0.0',
/**初始化方法**/
_init: function() {
var con = document.getElementById(this.options.id)
var canvas = document.createElement('canvas')
/*this.options.width = con.offsetWidth > 0 ? con.offsetWidth : "100";
this.options.height = con.offsetHeight > 0 ? con.offsetHeight : "30";*/
canvas.id = this.options.canvasId
canvas.width = this.options.width
canvas.height = this.options.height
canvas.style.cursor = 'pointer'
canvas.innerHTML = '您的浏览器版本不支持canvas'
con.appendChild(canvas)
var parent = this
canvas.onclick = function() {
parent.refresh()
}
},
/**生成验证码**/
refresh: function() {
this.options.code = ''
var canvas = document.getElementById(this.options.canvasId)
if (canvas.getContext) {
var ctx = canvas.getContext('2d')
}
ctx.textBaseline = 'middle'
ctx.fillStyle = randomColor(180, 240)
ctx.fillRect(0, 0, this.options.width, this.options.height)
if (this.options.type == 'blend') {
//判断验证码类型
var txtArr = this.options.numArr.concat(this.options.letterArr)
} else if (this.options.type == 'number') {
var txtArr = this.options.numArr
} else {
var txtArr = this.options.letterArr
}
for (var i = 1; i <= 4; i++) {
var txt = txtArr[randomNum(0, txtArr.length)]
this.options.code += txt
ctx.font = '20px SimHei'
//ctx.font = randomNum(this.options.height/2, this.options.height) + 'px SimHei'; //随机生成字体大小
ctx.fillStyle = randomColor(50, 160) //随机生成字体颜色
/* ctx.shadowOffsetX = randomNum(-3, 3);
ctx.shadowOffsetY = randomNum(-3, 3);*/
ctx.shadowBlur = randomNum(-3, 3)
ctx.shadowColor = 'rgba(0, 0, 0, 0.3)'
var x = (this.options.width / 5) * i
var y = this.options.height / 2
var deg = randomNum(-30, 30)
/**设置旋转角度和坐标原点**/
ctx.translate(x, y)
ctx.rotate((deg * Math.PI) / 180)
ctx.fillText(txt, 0, 0)
/**恢复旋转角度和坐标原点**/
ctx.rotate((-deg * Math.PI) / 180)
ctx.translate(-x, -y)
}
/**绘制干扰线**/
for (var i = 0; i < 4; i++) {
ctx.strokeStyle = randomColor(40, 180)
ctx.beginPath()
ctx.moveTo(
randomNum(0, this.options.width / 2),
randomNum(0, this.options.height / 2)
)
ctx.lineTo(
randomNum(0, this.options.width / 2),
randomNum(0, this.options.height)
)
ctx.stroke()
}
/**绘制干扰点**/
for (var i = 0; i < this.options.width / 4; i++) {
ctx.fillStyle = randomColor(0, 255)
ctx.beginPath()
ctx.arc(
randomNum(0, this.options.width),
randomNum(0, this.options.height),
1,
0,
2 * Math.PI
)
ctx.fill()
}
},
/**验证验证码**/
validate: function(code) {
var verifyCode = code.toLowerCase()
var v_code = this.options.code.toLowerCase()
if (verifyCode == v_code) {
return true
} else {
return false
}
}
}
/**生成字母数组**/
function getAllLetter() {
var letterStr =
'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'
return letterStr.split(',')
}
/**生成一个随机数**/
function randomNum(min, max) {
return Math.floor(Math.random() * (max - min) + min)
}
/**生成一个随机色**/
function randomColor(min, max) {
var r = randomNum(min, max)
var g = randomNum(min, max)
var b = randomNum(min, max)
return 'rgb(' + r + ',' + g + ',' + b + ')'
}
return new GVerify(id)
}
|
