网站登陆或会员注册页面要求网站能防止机器人功能（需要输入验证码，从而区别是机器还是人在操作）。
今天给大家分享的是一个前端验证的验证码。利用JS和CSS3的transform属性里的rotate设置旋转进行制作。
HTML页面代码：
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>分享：js+CSS3制作图形验证码|www.xin126.cn</title>
<script src="vCode.js"></script>
<script>
onload = function () {
var container1 = document.getElementById("vCode1");
var code1 = new vCode(container1);
document.getElementById("btn1").addEventListener("click", function () {
alert(code1.verify(document.getElementById("code1").value));
}, false);
var container2 = document.getElementById("vCode2");
var code2 = new vCode(container2, {
len: 5,
bgColor: "#444444",
colors: [
"#DDDDDD",
"#DDFF77",
"#77DDFF",
"#99BBFF",
//"#7700BB",
"#EEEE00"
]
});
document.getElementById("btn2").addEventListener("click", function () {
alert(code2.verify(document.getElementById("code2").value));
}, false);
};
</script>
</head>
<body>
<div>
<h1>验证码1</h1>
<input type="text" id="code1"/>
<div id="vCode1" style="width:100px; height: 30px; border: 1px solid #ccc; display: inline-block;"></div>
<button id="btn1">验证</button>
</div>
<div style="margin-top: 50px;">
<h1>验证码2</h1>
<input type="text" id="code2"/>
<div id="vCode2" style="width:100px; height: 30px; border: 1px solid #ccc; display: inline-block;"></div>
<button id="btn2">验证</button>
</div>
</body>
</html>
JS代码：
(function(){
var randstr = function(length){
var key = {
str : [
'a','b','c','d','e','f','g','h','i','j','k','l','m',
'o','p','q','r','s','t','x','u','v','y','z','w','n',
'0','1','2','3','4','5','6','7','8','9'
],
randint : function(n,m){
var c = m-n+1;
var num = Math.random() * c + n;
return Math.floor(num);
},
randStr : function(){
var _this = this;
var leng = _this.str.length - 1;
var randkey = _this.randint(0, leng);
return _this.str[randkey];
},
create : function(len){
var _this = this;
var l = len || 10;
var str = '';
for(var i = 0 ; i<l ; i++){
str += _this.randStr();
}
return str;
}
};
length = length ? length : 10;
return key.create(length);
};
var randint = function(n,m){
var c = m-n+1;
var num = Math.random() * c + n;
return Math.floor(num);
};
var vCode = function(dom, options){
this.codeDoms = [];
this.lineDoms = [];
this.initOptions(options);
this.dom = dom;
this.init();
this.addEvent();
this.update();
this.mask();
};
vCode.prototype.init = function(){
this.dom.style.position = "relative";
this.dom.style.overflow = "hidden";
this.dom.style.cursor = "pointer";
this.dom.title = "点击更换验证码";
this.dom.style.background = this.options.bgColor;
this.w = this.dom.clientWidth;
this.h = this.dom.clientHeight;
this.uW = this.w / this.options.len;
};
vCode.prototype.mask = function(){
var dom = document.createElement("div");
dom.style.cssText = [
"width: 100%",
"height: 100%",
"left: 0",
"top: 0",
"position: absolute",
"cursor: pointer",
"z-index: 9999999"
].join(";");
dom.title = "点击更换验证码";
this.dom.appendChild(dom);
};
vCode.prototype.addEvent = function(){
var _this = this;
_this.dom.addEventListener("click", function(){
_this.update.call(_this);
});
};
vCode.prototype.initOptions = function(options){
var f = function(){
this.len = 4;
this.fontSizeMin = 20;
this.fontSizeMax = 48;
this.colors = [
"green",
"red",
"blue",
"#53da33",
"#AA0000",
"#FFBB00"
];
this.bgColor = "#FFF";
this.fonts = [
"Times New Roman",
"Georgia",
"Serif",
"sans-serif",
"arial",
"tahoma",
"Hiragino Sans GB"
];
this.lines = 8;
this.lineColors = [
"#888888",
"#FF7744",
"#888800",
"#008888"
];
this.lineHeightMin = 1;
this.lineHeightMax = 3;
this.lineWidthMin = 1;
this.lineWidthMax = 60;
};
this.options = new f();
if(typeof options === "object"){
for(i in options){
this.options[i] = options[i];
}
}
};
vCode.prototype.update = function(){
for(var i=0; i<this.codeDoms.length; i++){
this.dom.removeChild(this.codeDoms[i]);
}
for(var i=0; i<this.lineDoms.length; i++){
this.dom.removeChild(this.lineDoms[i]);
}
this.createCode();
this.draw();
};
vCode.prototype.createCode = function(){
this.code = randstr(this.options.len);
};
vCode.prototype.verify = function(code){
return this.code === code;
};
vCode.prototype.draw = function(){
this.codeDoms = [];
for(var i=0; i<this.code.length; i++){
this.codeDoms.push(this.drawCode(this.code[i], i));
}
this.drawLines();
};
vCode.prototype.drawCode = function(code, index){
var dom = document.createElement("span");
dom.style.cssText = [
"font-size:" + randint(this.options.fontSizeMin, this.options.fontSizeMax) + "px",
"color:" + this.options.colors[randint(0, this.options.colors.length - 1)],
"position: absolute",
"left:" + randint(this.uW * index, this.uW * index + this.uW - 10) + "px",
"top:" + randint(0, this.h - 30) + "px",
"transform:rotate(" + randint(-30, 30) + "deg)",
"-ms-transform:rotate(" + randint(-30, 30) + "deg)",
"-moz-transform:rotate(" + randint(-30, 30) + "deg)",
"-webkit-transform:rotate(" + randint(-30, 30) + "deg)",
"-o-transform:rotate(" + randint(-30, 30) + "deg)",
"font-family:" + this.options.fonts[randint(0, this.options.fonts.length - 1)],
"font-weight:" + randint(400, 900)
].join(";");
dom.innerHTML = code;
this.dom.appendChild(dom);
return dom;
};
vCode.prototype.drawLines = function(){
this.lineDoms = [];
for(var i=0; i<this.options.lines; i++){
var dom = document.createElement("div");
dom.style.cssText = [
"position: absolute",
"opacity: " + randint(3, 8) / 10,
"width:" + randint(this.options.lineWidthMin, this.options.lineWidthMax) + "px",
"height:" + randint(this.options.lineHeightMin, this.options.lineHeightMax) + "px",
"background: " + this.options.lineColors[randint(0, this.options.lineColors.length - 1)],
"left:" + randint(0, this.w - 20) + "px",
"top:" + randint(0, this.h) + "px",
"transform:rotate(" + randint(-30, 30) + "deg)",
"-ms-transform:rotate(" + randint(-30, 30) + "deg)",
"-moz-transform:rotate(" + randint(-30, 30) + "deg)",
"-webkit-transform:rotate(" + randint(-30, 30) + "deg)",
"-o-transform:rotate(" + randint(-30, 30) + "deg)",
"font-family:" + this.options.fonts[randint(0, this.options.fonts.length - 1)],
"font-weight:" + randint(400, 900)
].join(";");
this.dom.appendChild(dom);
this.lineDoms.push(dom);
}
};
this.vCode = vCode;
}).call(this);
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