Detailed explanation of js console.log printing object and array usage-JS Tutorial-php.cn

Detailed explanation of js console.log printing object and array usage

高洛峰

Release： 2017-02-03 14:42:05

Original

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The example in this article describes the usage of js console.log printing objects and arrays. Share it with everyone for your reference, the details are as follows:

What is console.log? It is actually just a function for printing js arrays and objects, just like PHP's print_r, var_dump. There is nothing much to say about the console.log function itself. This blog will tell you how to use this function. Before talking about this function, I think what everyone uses most to view js output is alert, but alert can only play string or int

1. Test file test.html

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>console.log test</title>
</head>
<script type="text/javascript">
var testobj =
  {
    &#39;id&#39;: 1,
    &#39;content&#39;: &#39;test&#39;,
    &#39;firstname&#39;: function() {
      document.getElementById(&#39;firstname&#39;).value = "zhang";
    },
    &#39;lastname&#39;: function() {
      document.getElementById(&#39;lastname&#39;).value = "ying";
    }
  };
<!-- 打印对像 -->
  console.log(testobj);
</script>
<body>
   <input type="text" id=&#39;firstname&#39; name="firstname" value=&#39;&#39;>
   <input type="text" id=&#39;lastname&#39; name=&#39;lastname&#39; value=&#39;&#39;>
</body>
</html>

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2. Chrome development tools view js objects

js console.log打印对像与数组用法详解

console chrome

Now when I use chrome developer tools and firebug, they are half and half. Chrome developer tools also have a function that firebug does not have.

The console can run js. If the page is an iframe, firebug can only run on the parent, and chrome can select the page inside to execute. , if the picture below

js console.log打印对像与数组用法详解