GlobalEventHandlers.onload - Web APIs 编辑
The onload property of the GlobalEventHandlers mixin is an EventHandler that processes load events on a Window, XMLHttpRequest, <img> element, etc.
The load event fires when a given resource has loaded.
Syntax
target.onload = functionRef;
Value
functionRef is the handler function to be called when the window’s load event fires.
Examples
window.onload = function() {
init();
doSomethingElse();
};
<!doctype html>
<html>
<head>
<title>onload test</title>
// ES5
<script>
function load() {
console.log("load event detected!");
}
window.onload = load;
</script>
// ES2015
<script>
const load = () => {
console.log("load event detected!");
}
window.onload = load;
</script>
</head>
<body>
<p>The load event fires when the document has finished loading!</p>
</body>
</html>
Notes
The load event fires at the end of the document loading process. At this point, all of the objects in the document are in the DOM, and all the images, scripts, links and sub-frames have finished loading.
There are also DOM Events like DOMContentLoaded and DOMFrameContentLoaded (which can be handled using EventTarget.addEventListener()) which are fired after the DOM for the page has been constructed, but do not wait for other resources to finish loading.
Specifications
| Specification | Status | Comment |
|---|---|---|
| HTML Living Standard The definition of 'onload' in that specification. | Living Standard | Initial definition |
Browser compatibility
BCD tables only load in the browser
See also
loadeventDOMContentLoadedevent in Listening to events: Simple DOM events- IIFE Immediately-invoked function expression
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