Uncaught TypeError: Cannot read property 'getElementsByTagName' of null
I\'m trying to select elements with .getElementsByTagName().
var tags = document.body.getElementsByTagName(\"*\");
Current attemp
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Move the
<script>from the<head>element to the<body>element.
document.bodywon't get a value assigned to it until the body element has been created.Since you are trying to get all the elements in the
<body>, you'd want to be at the end of the body element. Or put it in a function and call it from an event that fires after the body has been created (such as thewindowloadevent). To read more about that try, https://developer.mozilla.org/en-US/docs/Web/API/Window/load_event.讨论(0) -
Function examples:
Page loaded with pure JavaScript
Page loaded with jQuery
Example with both methods:
function init() { alert("hello javascript"); }; window.addEventListener("load",init,false); $(document).ready(function () { alert("hello jQuery"); });http://jsfiddle.net/Ln5zu4Lt/
Be careful, the JavaScript example above waits for page load (images, iframes, etc.). This takes more time than jQuery's ready.
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