1 <script type="text/javascript">
2 function validateCode() {
3 var validatevalue = "";
4 var codes = new Array(4);
5 var colors = new Array("Red", "Green", "Gray", "Blue", "Maroon", "Aqua", "Fuchsia", "Lime", "Olive", "Silver");
6 for (var i = 0; i < codes.length; i++) {
7 codes[i] = Math.floor(Math.random() * 10);
8 validatevalue += codes[i];
9 }
10 var spans = document.getElementById("divCode").all;
11 for (var i = 0; i < spans.length; i++) {
12 spans[i].innerText = codes[i];
13 spans[i].style.color = colors[Math.floor(Math.random() * 10)];
14 }
15 document.getElementById("validatevalue").value = validatevalue;
16 }
17
18 function validate() {
19 if (document.getElementById("textfield3").value != document.getElementById("validatevalue").value) {
20 alert("验证码错误");
21 validateCode();
22 document.getElementById("textfield3").value = "";
23 document.getElementById("textfield3").focus();
24 return false;
25 } else {
26 return true;
27 }
28 }
29 document.onload = validateCode();
30 </script>
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