你好，我是新手，菜鸟，
<form action="bankPay.php" method="post" id="submitForm" target="_blank">
<input type="text" name="requestId" id="requestId" value=""/>
<input type="submit" value="提交" onclick="return check()" />
</form>
整个代码是这样，现在需要 id="requestId" 设置成随机字母或数字都可以，25位，每次刷新网页则自动生成，一个字符串变量，我看了你的回答，但不是很明白，你能不能详细写出来？非常感谢！
<script>
function uuid() {
var s = [];
var hexDigits = "0123456789abcdef";
for (var i = 0; i < 25; i++) {
s[i] = hexDigits.substr(Math.floor(Math.random() * 0x10), 1);
}
s[14] = "4"; // bits 12-15 of the time_hi_and_version field to 0010
s[19] = hexDigits.substr((s[19] & 0x3) | 0x8, 1); // bits 6-7 of the clock_seq_hi_and_reserved to 01
s[8] = s[13] = s[18] = s[23] = "-";
var uuid = s.join("");
document.getElementsByName("requestId")[0].id=uuid;
}
</script>
<body onload="uuid()">就可以了
function uuid() {
var s = [];
var hexDigits = "0123456789abcdef";
for (var i = 0; i < 25; i++) {
s[i] = hexDigits.substr(Math.floor(Math.random() * 0x10), 1);
}
s[14] = "4"; // bits 12-15 of the time_hi_and_version field to 0010
s[19] = hexDigits.substr((s[19] & 0x3) | 0x8, 1); // bits 6-7 of the clock_seq_hi_and_reserved to 01
s[8] = s[13] = s[18] = s[23] = "-";
var uuid = s.join("");
document.getElementsByName("requestId")[0].id=uuid;
}
</script>
<body onload="uuid()">就可以了
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