Question

我是编程新手，想练习。我想制作一个嵌入了javascript的html文档，该文档将在一个字段中有两个输入字段，用户将键入该句子，在第二个字段中，她将键入她要打印多少次，而不是单击按钮时该脚本将在＆＃34; printhere＆＃34;中打印该文本。 DIV。
我试过但失败了，以下是我的代码，有人可以告诉我我在弄什么？

<html>
<body>

<!-- form started -->
<form>
<!-- what sentence to print -->
What to write?<br>
<input id="what"><br><br>

<!-- how many times to print -->
How many times ?<br>
<input id="howmany"><br><br>

<!-- the button -->
<button type="button" onclick="printItNow()">Print Now</button>
<form>
<!-- form ended -->

<!-- the div where the content will print -->
<div id="printhere">

</div>


<script>
function printItNow() {
    var printhere = document.getElementById('printhere');
    var whatto = document.getElementById('what');
    var howmany = document.getElementById('howmany');


    for (var i=0; i<howmany; i++) {
        printhere.innerHTML += whatto;
    }
}

</script>

</body>
<html>

谢谢大家。：）

Answer 1

您错过.value，在document.getElementById()中，更改：

var whatto = document.getElementById('what');
var howmany = document.getElementById('howmany');

到

var whatto = document.getElementById('what').value;
var howmany = document.getElementById('howmany').value;

Answer 2

Change 
var whatto = document.getElementById('what');
to 
var whatto = document.getElementById('what').value;


var howmany = document.getElementById('howmany');
to 
var howmany = document.getElementById('howmany').value;

and

printhere.innerHTML += whatto;
to
printhere.innerHTML += whatto+"<br>";

第三个变化不一定是技术上的，但它会将每个句子放在自己的行上。

使用javascript打印给定时间的给定句子

2 个答案: