attachEvent Doesn't work in IE > 8.0

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I\'m using attachEvent for a while, but it seems that IE doesn\'t support this anymore?

window.attachEvent(\"onload\",Start_Wysiwyg);
window.attachEvent(\"onscro


                      
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                  天命终不由人        
                
              
                            
                2021-02-05 21:51
              
            
            
                                                                       
.attachEvent() is deprecated in IE9+, and has been removed in IE11.

The standard is .addEventListener() (MSDN docs). The MDN docs have a section about compatibility.

You can simply run some feature-checking code to check if the supported features exist:

if (window.addEventListener) {
    // Check for addEventListener first, since IE9/10 have both,
    // but you should use the standard over the deprecated IE-specific one
    window.addEventListener('click', myFunc);
} else if (window.attachEvent) {
    window.attachEvent('onclick', myFunc);
}


If you have to attach a lot of event listeners, then you may want to just cache the desired listener attachment method in a variable and use that variable for attaching your events throughout your code, rather than having that above check for every single event listener:

var addListener = function(){}; // Default to no-op function

if (window.addEventListener) {
    addListener = window.addEventListener;
} else if (window.attachEvent) {
    addListener = function(eventType, listener, useCapture) {
        // attachEvent wants 'oneventType' instead of 'eventType'
        window.attachEvent('on'+eventType, listener, useCapture);
    };
}

// Now you can add listeners with a browser-agnostic function call!
addListener('click', myFunc);
addListener('hover', myOtherFunc);




You can read more in a duplicate question linked by @MartyIX in a comment on your question. There are further nuances and methods in the answers/comments there, such as IE9 requiring <!DOCTYPE html> in order to use .addEventListener().
                                                                        
                                                        
            
            
              
                
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