Question

我有一个简单的应用程序，可以计算数组内部的重复数字。用户通过提示输入数字（即2,1,2,2）。

当我想通过document.write（）函数输出结果（这是一个对象）时，我得到： [object Object]

当我通过控制台输出时，我得到了我期望的结果：对象{2：3,1：1}

下面是html和js，可以找到Plunkr here

我希望将对象的结果写在页面上......

HTML

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<!--    JAVASCRIPT AND JQUERY STUFF -->
<script src="https://code.jquery.com/jquery-3.2.1.js" integrity="sha256-DZAnKJ/6XZ9si04Hgrsxu/8s717jcIzLy3oi35EouyE=" crossorigin="anonymous">

</script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous">

</script>
<script src="number-list.js"></script>
</head>
<body>
<h1>Enter numbers when prompted!</h1>
<p>Here are the numbers entered on the left and frequency of occurence on the right.</p>
</body>
</html>

JAVASCRIPT

$(document).ready(function(){
var n = prompt("Enter your numbers").split(",");
console.log(n);
var counts = {};
n.forEach(function(x){ 
counts[x] = (counts[x] || 0) +1; 
});
console.log(counts);
document.write(
"<h1>Enter numbers when prompted!</h1>" +
"<p>You entered following numbers:</p>" + n + "<br/>" +
"<p>The occurence is as follows:</p>" + counts);
});

Answer 1

使用JSON.stringify(counts)序列化您的对象，然后您可以在HTML

中打印它

document.write(
"<h1>Enter numbers when prompted!</h1>" +
"<p>You entered following numbers:</p>" + n + "<br/>" +
"<p>The occurence is as follows:</p>" + JSON.stringify(counts));
});

Answer 2

你不能。 HTML无法解析objects。但是，您可以将object转换为string

＆＃13;

$(document).ready(function(){
var n = prompt("Enter your numbers").split(",");
console.log(n);
var counts = {};
n.forEach(function(x){ 
counts[x] = (counts[x] || 0) +1; 
});
console.log(counts);
document.write(
"<h1>Enter numbers when prompted!</h1>" +
"<p>You entered following numbers:</p>" + JSON.stringify(n) + "<br/>" +
"<p>The occurence is as follows:</p>" + JSON.stringify(counts));
});

＆＃13;

<script src="https://code.jquery.com/jquery-3.2.1.js" integrity="sha256-DZAnKJ/6XZ9si04Hgrsxu/8s717jcIzLy3oi35EouyE=" crossorigin="anonymous">

</script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous">

</script>
<script src="number-list.js"></script>
<body>
<h1>Enter numbers when prompted!</h1>
<p>Here are the numbers entered on the left and frequency of occurence on the right.</p>

<div id="content"></div>

＆＃13;

Answer 3

您可以使用JSON.stringify(counts)

将对象转换为字符串

$(document).ready(function(){
  var n = prompt("Enter your numbers").split(",");
  console.log(n);
  var counts = {};
  n.forEach(function(x){ 
    counts[x] = (counts[x] || 0) +1; 
  });
  console.log(counts);
  document.write(
  "<h1>Enter numbers when prompted!</h1>" +
  "<p>You entered following numbers:</p>" + n + "<br/>" +
  "<p>The occurence is as follows:</p>" + counts);
});

如何使用document.write（）

3 个答案: