文字+ randomchar不起作用[JavaScript] [英] Text + randomchar doesn't work [JavaScript]

问题描述

<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>

我如何键入以下内容:例如23 * 45-13/等. 怎么了? 它只显示2个数字，之后不显示任何字符.

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.

推荐答案

代码存在一些问题:

• 您尚未在函数中指定lastNumber参数.
• 您将返回使用该参数的代码，但是无法从执行代码的地方到达.
• 返回的代码使用document.write的返回值，尽管它不返回任何内容.
• 返回的代码没有脚本标签，因此将仅显示在页面上而不执行.
• 您既要在函数中写入数字，又要返回用于编写它的代码.

• 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.

也:

• 您使用的循环仅循环一次，这毫无意义.

只需使函数返回字符串而不是返回代码即可:

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>

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