Setting method: 1. Use the src attribute of the element object, the syntax "img element object.src="attribute value""; 2. Use the setAttribute() method, the syntax "img element object.setAttribute("src ","Attribute value")".
The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.
javascript sets img src value
Method 1: Use the src attribute of the element object
<!DOCTYPE html>
<html>
<body>
<img src="/static/imghwm/default1.png" data-src="img/1.jpg" class="lazy" style="max-width:90%" / alt="How to set img src value in javascript" >
<p id="demo">点击按钮来改变img标签的内容。</p>
<button onclick="myFunction()">试一下</button>
<script>
function myFunction() {
var img = document.getElementsByTagName("img")[0];
img.src = "img/2.jpg";
}
</script>
</body>
</html>Rendering:
Method 2: Use the setAttribute() method
setAttribute() method to add the specified attribute , and assign the specified value to it. If this specified property already exists, the value is only set/changed.
<!DOCTYPE html>
<html>
<body>
<img src="/static/imghwm/default1.png" data-src="img/1.jpg" class="lazy" style="max-width:90%" / alt="How to set img src value in javascript" >
<p id="demo">点击按钮来改变img标签的内容。</p>
<button onclick="myFunction()">试一下</button>
<script>
function myFunction() {
var img = document.getElementsByTagName("img")[0];
img.setAttribute("src","img/3.jpg");
}
</script>
</body>
</html>Rendering:
[Recommended learning: javascript advanced tutorial]
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