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1. It can be executed in the Body.
<Body onload = "alert (123)"> </body>
2. Define to useCopy codeThe Code is as follows: <script type = "text/javascript">
Function test (){
Var aa = "hey, you are a pig ";
Alert (aa );
}
Window. onload = test;
</Script>
Annotation: Here window. onload = test; do not add () to the end of test because this is the method for triggering event Association.
If you add (), the execution of this method is immediately triggered (this may not be our intention)
3. Use anonymous Functions
<Script> window. onload = function () {alert (321) ;}</script>
4. How do I write multiple onload events in JS?
<1> <body onload = "aa (); bb (); cc ()"> separate them with semicolons.
<2>
Window. attachEvent ("onload", function () {alert ('A ')});
Window. attachEvent ("onload", function () {alert ('B ')});
Window. attachEvent ("onload", function () {alert ('C ')});
Annotation: Use attachEvent to register an event before the event registration is executed first.
In the above example, c B A is displayed.
Another point: This method can only be used in IE (window. attachEvent)
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