<p id = 'click'>click me</p>
<script>
document.getElementById('click').onclick = function(event){
alert(event.target);
}
</script>
var click = document.getElementById('click');
click.onclick = function(){
alert('you click the first function');
};
click.onclick = function(){
alert('you click the second function')
}
<div id = 'outer' style = 'margin: 100px 0 0 100px; width: 200px;height: 200px; background: red;'> <div id="inner" style = 'margin-left:20px; width: 50px;height:50px; background: green;'></div> </div>
<div id = 'outer' style = 'margin: 100px 0 0 100px; width: 200px;height: 200px; background: red;'>
<div id="inner" style = 'margin-left:20px; width: 50px;height:50px; background: green;'></div>
</div>
<script>
var click = document.getElementById('inner');
click.addEventListener('click',function(){
alert('click one');
},false);
click.addEventListener('click',function(){
alert('click two');
},false);
</script>
<div id = 'outer' style = 'margin: 100px 0 0 100px; width: 200px;height: 200px; background: red;'>
<div id="inner" style = 'margin-left:20px; width: 50px;height:50px; background: green;'></div>
</div>
<script>
var click = document.getElementById('inner');
var clickouter = document.getElementById('outer');
click.addEventListener('click',function(){
alert('inner show');
},true);
clickouter.addEventListener('click',function(){
alert('outer show');
},true);
</script>
alickouter.addEventListener('click',function(){
alert('outer show');
},false);
<script>
var click = document.getElementById('inner');
var clickouter = document.getElementById('outer');
click.addEventListener('click',function(){
alert('capture show');
},true);
click.addEventListener('click',function(){
alert('bubble show');
},false);
</script>
<script>
var click = document.getElementById('inner');
var clickouter = document.getElementById('outer');
click.addEventListener('click',function(event){
alert('inner show');
event.stopPropagation();
},false);
clickouter.addEventListener('click',function(){
alert('outer show');
},false);
</script>
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