先看看代码 randnum.php
<?php
session_start();
$arr2=range(0,9);
$arr3=range("A","Z");
$arr=array_merge($arr2,$arr3);
$keys=array_rand($arr,6);
$str=" ";
foreach($keys as $i)
$str.=$arr[$i];
$_SESSION["randValid"]=$STR;
header("Content-type: image/png");
$im = @imagecreatetruecolor(70,30)
or die("Cannot Initialize new GD image stream");for ($i=1;$i<10;$i++){
$line_color = imagecolorallocate($im,rand(0,156),rand (0,156), rand(0,156));
imageline($im,rand(0,70),rand(0,30),rand(0,70),rand(0,30),$line_color);
}$text_color = imagecolorallocate($im,rand(0,255), rand(0,255), rand(0,255));
imagestring($im, 5,3, 5, $str, $text_color);
imagepng($im);
imagedestroy($im);
?> 在看一下调用方法
<html><script language="javascript">
function RefreshImage()
{
var el =document.getElementById("unum");
el.src='include/randnum.php';//这个特别重要
}
</script>
<body>
<input type="text" name="unum" id="unum" size="10" maxlength=4 />*
<img src="include/randnum.php" title="单击刷新" style="cursor:pointer" onMouseUp=" RefreshImage()" />
<span>点击图片刷新</span></body>
</html>那个地方错了。 能够出现验证码, 但无法实现点击刷新
<?php
session_start();
$arr2=range(0,9);
$arr3=range("A","Z");
$arr=array_merge($arr2,$arr3);
$keys=array_rand($arr,6);
$str=" ";
foreach($keys as $i)
$str.=$arr[$i];
$_SESSION["randValid"]=$STR;
header("Content-type: image/png");
$im = @imagecreatetruecolor(70,30)
or die("Cannot Initialize new GD image stream");for ($i=1;$i<10;$i++){
$line_color = imagecolorallocate($im,rand(0,156),rand (0,156), rand(0,156));
imageline($im,rand(0,70),rand(0,30),rand(0,70),rand(0,30),$line_color);
}$text_color = imagecolorallocate($im,rand(0,255), rand(0,255), rand(0,255));
imagestring($im, 5,3, 5, $str, $text_color);
imagepng($im);
imagedestroy($im);
?> 在看一下调用方法
<html><script language="javascript">
function RefreshImage()
{
var el =document.getElementById("unum");
el.src='include/randnum.php';//这个特别重要
}
</script>
<body>
<input type="text" name="unum" id="unum" size="10" maxlength=4 />*
<img src="include/randnum.php" title="单击刷新" style="cursor:pointer" onMouseUp=" RefreshImage()" />
<span>点击图片刷新</span></body>
</html>那个地方错了。 能够出现验证码, 但无法实现点击刷新
這個僅僅是修改了src的地址並沒有真正刷新了頁面吧?需要增加onclick事件.
<input type="text" name="unum" id="unum" size="10" maxlength=4 />
目标都搞错了,结果怎么能正确呢?
{
var el =document.getElementById("unum1");
el.src='include/randnum.php';//这个特别重要
}