Method: 1. Use the "document.getElementById('id value')" statement to obtain the picture object; 2. Use "picture object.setAttribute("width", "width value")" or "picture object The .style.width="value" statement changes the image width.
The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.
Javascript method to change the width of the image
<img id="img" src="img/2.jpg" style="max-width:90%" style="max-width:90%"/ alt="How to change image width with javascript" >
1. Get the image object based on the id value
var img=document.getElementById('img');
2. Use setAttribute("width", "value") or the width attribute of the style object to change the image width
img.setAttribute("width", "宽度值");
// 或
img.style.width = "宽度值";Complete implementation code:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
</head>
<body>
<img id="img" src="img/2.jpg" style="max-width:90%" style="max-width:90%" / alt="How to change image width with javascript" ><br /><br />
<button onclick="myFunction()">改变图片宽度</button>
<script type="text/javascript">
function myFunction() {
var img = document.getElementById('img');
// img.setAttribute("width", "300");
img.style.width = "300px";
}
</script>
</body>
</html>Rendering:
[Recommended learning: javascript advanced tutorial]
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