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Some questions and answers on the use of document.write in js_javascript skills
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JS Tutorial
Some questions and answers on the use of document.write in js_javascript skills
Some questions and answers on the use of document.write in js_javascript skills
May 16, 2016 pm 04:54 PMI am a newbie, so I recorded it. This answer was seen on Baidu, so it is considered a reprint.
The following content explains why if document.write is called after the page is loaded, the entire document will be overwritten.
The [HTML output] in the prompt refers to when the page is loaded.
Copy code The code is as follows:
<html>
<head>< ;/head>
<body>
<script type="text/javascript">document.write("<p>Hello</p>");</script>
</body>
</html>
When the page is loaded, you will see Hello on the page. View the source file which is the code above.
---------------------
But if the page has been loaded, use document.write again, That will cover the entire document.
Copy code The code is as follows:
<html>
<head>< ;/head>
<body>
<script type="text/javascript">
// Called when the mouse is clicked document.write
document.onclick = function() {
document.write("<span>Javascript</span>");
};
</script>
</body>
</html>
Because the mouse action is executed after the page is loaded, the entire page will be covered by <span>Javascript</span>. Viewing the source file now will only see <span>Javascript</span>.
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