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  DOM event handlers add notes
  Add Date : 2018-11-21      
  Today, the system browser DOM event model of its deeper understanding of the future needs to be done in a day. First mark about the basic, deeper impression.

DOM element method to add an event handler:

1. Direct write tag js code

< Body onload = "var i = 1; alert (i);" >
< / Body >

2. Write a function name tag

< Head >
     < Script >
     function hi () {
       alert ( "hi");
     < / Script >
< / Head >
< Body onload = "hi ();" >
< / Body >

The essence of the above two methods are the same, is called inline mode, the lowest efficiency.

3.js script to specify the function to the event property

window.onload = hi;

This method can be better than the previous two kinds of number, called the traditional model. Inline mode and traditional mode are all DOM Level 0 event model, it is no longer recommended.

4. Do not rely on the element attribute listener

document.addEventListener ( "click", hi, true);

In this way it belongs to DOM Level 2 event model is more efficient than all of the aforementioned method. The new way is not dependent on a specific event processing property, you can register multiple handlers for any period of time any object.
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