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能够加一个a标签

发布时间:2020-01-02 20:01编辑:威尼斯正规官网浏览(135)

    效果:

    图片 1图片 2

    myvcode.class.php:封装创制验证码的类

    /*
    * file:myvcode.class.php
    * 验证码类,类名Vcode
    */
    class Vcode
    {
    private $width;              /*验证码宽度*/
    private $height;             /*验证码高度*/
    private $codeNum;            /*验证码字符个数*/
    private $checkCode;            /*验证码字符*/
    private $image;                /*验证码资源*/
    private $pixNum;            /*绘制干扰点的个数*/
    private $lineNum;            /*绘制干扰线的条数*/
    
    /*
    *构造方法实例化验证码对象,并初始化数据
    *@param int $width         设置默认宽度
    *@param int $height     设置默认高度
    *@param int $codeNum    设置验证码中的字符个数
    *@param int $pixNum        设置干扰点的个数
    *@param int $lineNum    设置干扰线的数量
    */
    function __construct($width=80,$height=40,$codeNum=4,$pixNum=40,$lineNum=5)
    {
    $this->width = $width;
    $this->height = $height;
    $this->codeNum = $codeNum;
    $this->pixNum = $pixNum;
    $this->lineNum = $lineNum;
    }
    /*内部私有方法,创建图像资源*/
    private function getCreateImage()
    {
    $this->image = imagecreatetruecolor($this->width, $this->height);
    $white = imagecolorallocate($this->image,0xff,0xff,0xff);
    imagefill($this->image, 0, 0, $white);
    $black = imagecolorallocate($this->image,0,0,0);
    imagerectangle($this->image, 0, 0, $this->width-1, $this->height-1, $black);
    }
    /*内部私有方法,绘制字符,去掉o0Llz和012*/
    private function createCheckCode()
    {
    $code = '3456789abcdefghijkmnpqrstuvwxyABCDEFGHIJKMNPQRSTUVWXY';
    $this->checkCode = "";
    for($i=0; $icodeNum;$i++)
    {
    $char = $code{rand(0,strlen($code) - 1)};
    $this->checkCode .= $char;
    $fontColor = imagecolorallocate($this->image, rand(0,128), rand(0,128),rand(0,128));
    $fontSize = rand(3,5);
    $x = rand(0,$this->width-imagefontwidth($fontSize));
    $y = rand(0,$this->height-imagefontheight($fontSize));
    imagechar($this->image, $fontSize, $x, $y, $char, $fontColor);
    }
    }
    /*内部私有方法设置干扰元素*/
    private function setDisturbColor()
    {
    /*绘制干扰点*/
    for($i=0; $ipixNum; $i++)
    {
    $color = imagecolorallocate($this->image, rand(0,255), rand(0,255), rand(0,255));
    imagesetpixel($this->image, rand(1,$this->width-2), rand(1,$this->height-2), $color);
    }
    /*绘制干扰线*/
    for($i=0; $ilineNum; $i++)
    {
    $color = imagecolorallocate($this->image, rand(0,255), rand(0,255), rand(0,255));
    imageline($this->image, rand(1,$this->width / 2), rand(1,$this->height / 2),
    rand($this->width / 2,$this->width – 2), rand($this->height / 2,$this->height – 2), $color);
    
    }
    }
    /*开启session保存 利用echo 输出图像*/
    function __toString()
    {
    $_SESSION['code'] = strtoupper($this->checkCode);
    $this->getCreateImage();
    $this->createCheckCode();
    $this->setDisturbColor();
    $this->outputImg();
    }
    /*内部私有方法输出图像*/
    private function outputImg()
    {
    header("content-type:image/png");
    imagepng($this->image);
    }
    /*析构方法,释放对象*/
    function __destruct()
    {
    imagedestroy($this->image);
    }
    }
    ?>
    

    imgcode.php输出图像

    test.html:同过img标签援引

    能够加二个a标签,用js达成换一张效果:

    /*黄金年代对刷新换验证码*/
    function changeCode()
    {
    var imgcode = document.getElementById(‘code');
    var change = document.getElementById(‘change');
    change.onclick = function()
    {
    /*必得加后边的参数技能刷新*/
    imgcode.src='code.php?tm'+Math.random();
    }
    }

    code和change分别是img和a的id

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