JS: window. onload event details

You may have encountered this situation. , In JS OfCodeUsed Window. onload After , May affect Body In Onload Event. You can write all Body And can be put in all Window. onload But this is not very convenient, sometimes we need two at the same time. Use Window. attachevent And Window. addeventlistener To solve the problem.

The following is a solution.

If (document. All ){

Window. attachevent ('onload ', Function Name ) // IE Medium

}

Else {

Window. addeventlistener ('load ', Function Name , False); // Firefox

} In recent work Attachevent Method. This method can append other processing events to an event, which may be useful sometimes. Here we will summarize its basic usage.

Its syntax can be viewed in 《 DHTML The manual contains a detailed description. Here is an example from the Internet:

Document. getelementbyid ("BTN"). onclick = Method1;

Document. getelementbyid ("BTN"). onclick = method2;

Document. getelementbyid ("BTN"). onclick = method3;

If you write , Then only Medhot3 Executed

Write as follows:

VaR btn1obj = Document. getelementbyid ("btn1 ");

// Object. attachevent (event, function );

Btn1obj. attachevent ("onclick", Method1 );

Btn1obj. attachevent ("onclick", method2 );

Btn1obj. attachevent ("onclick", method3 );

The execution order is Method3-> method2-> Method1

If yes Mozilla Series, does not support this method, need to use Addeventlistener

VaR btn1obj = Document. getelementbyid ("btn1 ");

// Element. addeventlistener (type, listener, usecapture );

Btn1obj. addeventlistener ("click", Method1, false );

Btn1obj. addeventlistener ("click", method2, false );

Btn1obj. addeventlistener ("click", method3, false );

The execution order is Method1-> method2-> method3

Comprehensive instance:

Window. onload = function () {function1 (); function2 ();}

Function addloadevent (func ){

VaR oldonload = Window. onload;

If (typeof window. onload! = 'Function '){

Window. onload = func;

} Else {

Window. onload = function (){

Oldonload ();

Func ();

}

}

}

Add the event to be loaded :

Addloadevent (AAA );

Addloadevent (BBB );

So if you wantProgramTo assign multiple processing processes to an event, you just need to judge the browser first, and then select to use Attachevent Or Addeventlistener You can. The instance is as follows:

If (document. All ){

Window. attachevent ('onload', handler1 );

Window. attachevent ('onload', handler2 );

} Else {

Window. addeventlistener ('load', handler1, false );

Window. addeventlistener ('load', handler2, false );

}

<SCRIPT type = "text/JavaScript">

Window. onload = function (){

VaR sdmodel = new scrolldoor ();

Sdmodel. SD (["M01", "M02", "M03", "m04", "m05"], ["c01", "C02", "C03 ", "C04", "c05"], "sd01", "sd02 ");

Mqobj (leftnext, "960", "109", "10 ","")

}

</SCRIPT>

 

 

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