随机数脚本 [英] Random Number Script
问题描述
这个脚本会将一个随机数写入文档写入标签，
我一直试图让它写入
$ b之外的输入表格框$ b javascript，任何帮助表示赞赏。谢谢Joe
http://web2jo.com/Work/ Random_Temp.html
Hi, This script will write a random number into a document write tag,
I''ve been trying to get it to write into a input form box outside the
javascript, any help is appreciated. Thanks Joe
http://web2jo.com/Work/Random_Temp.html
推荐答案
" Papajo" <做***** @ webtv.net>在消息中写道
news：21 *************** @ storefull-3336.bay.webtv.net ...
"Papajo" <do*****@webtv.net> wrote in message
news:21***************@storefull-3336.bay.webtv.net...
这个脚本会将一个随机数写入文档写入标记，
我一直试图将它写入
javascript之外的输入表单框，任何帮助表示赞赏。谢谢Joe
http://web2jo.com/Work/ Random_Temp.html
Hi, This script will write a random number into a document write tag,
I''ve been trying to get it to write into a input form box outside the
javascript, any help is appreciated. Thanks Joe
http://web2jo.com/Work/Random_Temp.html
这会有帮助吗？
< html>
< head>
< title> Random.htm< / title>
< script type =" text / javascript">
函数getRandomNum（lbound，ubound）{
var num = Math.floor（Math.random（）*（ubound - lbound））+ lbound;
文件.forms [0] .text.value = num;
}
< / script>
< / script>
< / head>
< body>
< form>
< input type =" text" ;命名= QUOT;文本"大小= QUOT; 6英寸readonly>
< input type =" button" value =" Random"
onclick =" getRandomNum（111111,999999）">
< / form>
< ; / body>
< / html>
Will this help?
<html>
<head>
<title>Random.htm</title>
<script type="text/javascript">
function getRandomNum(lbound, ubound) {
var num = Math.floor(Math.random() * (ubound - lbound)) + lbound;
document.forms[0].text.value = num;
}
</script>
</script>
</head>
<body>
<form>
<input type="text" name="text" size="6" readonly>
<input type="button" value="Random"
onclick="getRandomNum(111111,999999)">
</form>
</body>
</html>
我不得不稍微修改脚本，但效果很好，谢谢Joe
< script type =" text / javascript">
函数getRandomNum（lbound，ubound）{
var num =（Math.floor（ Math.random（）*（ubound - lbound））+ lbound）;
document.forms [0] .text.value = num;
}
< / script>
< / head>
< body>
< form>
< input type =" text"命名= QUOT;文本"大小= QUOT; 6英寸readonly>
< input type =" button" value =" Random"
onclick =" getRandomNum（111111,999999）">
< / form>
I had to modify the script a little but it works great, Thanks Joe
<script type="text/javascript">
function getRandomNum(lbound, ubound) {
var num = (Math.floor(Math.random() * (ubound - lbound)) + lbound);
document.forms[0].text.value = num;
}
</script>
</head>
<body>
<form>
<input type="text" name="text" size="6" readonly>
<input type="button" value="Random"
onclick="getRandomNum(111111,999999)">
</form>
McKirahan写道：
McKirahan wrote:
" Papajo" <做***** @ webtv.net>写了[...]
"Papajo" <do*****@webtv.net> wrote [...]
这个脚本会将一个随机数写入文档写入标签，
我一直试图让它写入外面的输入表单框
javascript，任何帮助表示赞赏。谢谢Joe
http://web2jo.com/Work/ Random_Temp.html
这会有帮助吗？
Hi, This script will write a random number into a document write tag,
I''ve been trying to get it to write into a input form box outside the
javascript, any help is appreciated. Thanks Joe
http://web2jo.com/Work/Random_Temp.html
Will this help?
不是真的。
[...]
function getRandomNum（lbound，ubound）{
var num = Math.floor（Math.random（）*（ubound - lbound））+ lbound;
document.forms [0] .text.value = num;
}
Not really.
[...]
function getRandomNum(lbound, ubound) {
var num = Math.floor(Math.random() * (ubound - lbound)) + lbound;
document.forms[0].text.value = num;
}
- 让lbound为1.
- 让ubound为10.
- 让Math.random（）返回0.99。
- 返回
Math.floor（0.99 *（10 - 1））+ 1
= Math.floor（8.91）+ 1
= 8 + 1
= 9
自Math.random（）总是返回小于1的东西，不可能
结果是10.但请记住：我们说的是一个随机整数
_closed_interval [x，y]，即包含的边界。如果
上限为y且y为整数，则返回y的概率应为
大于零。这意味着你的算法在右侧开放区间[x，y）中计算一个随机的
整数，这不是指定的
。
这个问题可以通过使用Math.round（）代替Math.floor（）和
舍入计算的浮点数来解决。使用
函数getRandomNum（lbound，ubound）
{
返回Math.round（Math.random（）*（ubound） - lbound）+ lbound）;
}
document.forms [0] .text.value = getRandomNum（1,10）;
- 让lbound为1.
- 让ubound为10.
- 让Math.random（）返回0.99。
- 返回
Math.round（0.99 *（10 - 1）+ 1）
= Math.round（0.99 * 9 + 1）
= Math.round（8.91 + 1）
= Math.round（9.91）
= 10
- 让lbound为1.
- 让ubound为10.
- 让Math.random（）返回0.01。
- 返回
Math.round（0.01 *（10 - 1）+ 1）
= Math.round（0.01 * 9 + 1）
= Math.round（0.09 + 1）
= Math.round（1.09）
= 1
因为Math.random（）永远不会返回小于0的东西，并且总是
小于1的东西（ECMAScript 3,15.8.2.14），那个alg orithm是安全的。
PointedEars
- Let lbound be 1.
- Let ubound be 10.
- Let Math.random() return 0.99.
- That returns
Math.floor(0.99 * (10 - 1)) + 1
= Math.floor(8.91) + 1
= 8 + 1
= 9
Since Math.random() always returns something less than 1, it is not possible
that the result is 10. But remember: we are speaking of a random integer
in the _closed_ interval [x, y], that is, the bounds are included. If the
upper bound is y and y is an integer, the probability of returning y should
be greater than zero. Meaning that your algorithm computes a random
integer in the right-hand side open interval [x, y) which is not what was
specified.
This problem can be solved by using Math.round() instead of Math.floor() and
rounding a computed floating-point number. With
function getRandomNum(lbound, ubound)
{
return Math.round(Math.random() * (ubound - lbound) + lbound);
}
document.forms[0].text.value = getRandomNum(1, 10);
- Let lbound be 1.
- Let ubound be 10.
- Let Math.random() return 0.99.
- That returns
Math.round(0.99 * (10 - 1) + 1)
= Math.round(0.99 * 9 + 1)
= Math.round(8.91 + 1)
= Math.round(9.91)
= 10
- Let lbound be 1.
- Let ubound be 10.
- Let Math.random() return 0.01.
- That returns
Math.round(0.01 * (10 - 1) + 1)
= Math.round(0.01 * 9 + 1)
= Math.round(0.09 + 1)
= Math.round(1.09)
= 1
Since Math.random() will never return something less than 0, and always
something less than 1 (ECMAScript 3, 15.8.2.14), that algorithm is safe.
PointedEars
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