文本 + randomchar 不起作用 [JavaScript]

发布于 2024-10-10 08:13:58 字数 366 浏览 0 评论 0原文

<script>
function makeid()
{
var text = "var text = document.write(lastNumber);";
var possible = "*+-/";
for( var i=0; i < 1; i++ )
document.write(lastNumber + possible.charAt(Math.floor(Math.random() * possible.length));
return text;
}
document.write(makeid(1))</script>

我如何输入例如：23* 45- 13/等等。怎么了？它只显示 2 个数字，后面没有字符。

原文

<script>
function makeid()
{
var text = "var text = document.write(lastNumber);";
var possible = "*+-/";
for( var i=0; i < 1; i++ )
document.write(lastNumber + possible.charAt(Math.floor(Math.random() * possible.length));
return text;
}
document.write(makeid(1))</script>

How do i make this to type for ex: 23* 45- 13/ and so on.
What is wrong?
It just show me 2 numbers and no char after.

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桜花祭 2024-10-17 08:13:58

代码存在一些问题：

您没有在函数中指定lastNumber 参数。
您正在返回使用该参数的代码，但无法从执行代码的位置访问它。
返回的代码使用 document.write 的返回值，尽管它不返回任何内容。
返回的代码没有script标签，所以它只会显示在页面上而不是执行。
您既要在函数中写入数字，又要返回写入数字的代码。

另外：

您使用的循环仅循环一次，这是毫无意义的。

只需让函数返回字符串而不是返回代码：

<script type="text/javascript">
function makeid(lastNumber) {
  var possible = "*+-/";
  return lastNumber + possible.charAt(Math.floor(Math.random() * possible.length));
}
document.write(makeid(1));
</script>

There are some problems with the code:

You haven't specified the lastNumber parameter in the function.
You are returning code that uses the parameter, but it's not reachable from where the code is executed.
The returned code uses the return value of document.write although it doesn't return anything.
The returned code doesn't have a script tag, so it will just be displayed on the page instead of executed.
You are both writing the number in the function and returning code for writing it.

Also:

You are using a loop that only loops once, which is pointless.

Just make the function return the string instead of returning code:

<script type="text/javascript">
function makeid(lastNumber) {
  var possible = "*+-/";
  return lastNumber + possible.charAt(Math.floor(Math.random() * possible.length));
}
document.write(makeid(1));
</script>

回复收藏 0 原文

如痴如狂 2024-10-17 08:13:58

<script>
function makeid()
{
var text = document.write(lastNumber);
var possible = "*-+/";
for( var i=0; i < 1; i++ )
text += possible.charAt(Math.floor(Math.random() * possible.length));
return text;
}
document.write(makeid(1))</script>

这有效，但我得到“88undefined+”，什么是未定义的，我该如何删除它？

<script>
function makeid()
{
var text = document.write(lastNumber);
var possible = "*-+/";
for( var i=0; i < 1; i++ )
text += possible.charAt(Math.floor(Math.random() * possible.length));
return text;
}
document.write(makeid(1))</script>

that worked but i get "88undefined+ " what is undefinded and how do i delete it?

回复收藏 0 原文

~没有更多了~