监听事件

 1 btn.onclick = function (ev1) {
 2             // alert(0);
 3             window.location.href = 'http://www.itlike.com';
 4         };
 5 btn.onclick = function (ev1) {
 6             // alert(1);
 7             window.location.href = 'http://www.baidu.com';
 8         };
 9 btn.onclick = function (ev1) {
10             // alert(1);
11             window.location.href = 'http://www.tmall.com';
12         }
13 
14 后面的会覆盖前面的事件

 1  window.onload = function (ev) {
 2         var btn = document.getElementById('btn');
 3         btn.onclick = function (ev1) {
 4             // alert(0);
 5             window.location.href = 'http://www.itlike.com';
 6         };
 7         btn.onclick = function (ev1) {
 8             // alert(1);
 9             window.location.href = 'http://www.baidu.com';
10         };
11         btn.onclick = function (ev1) {
12             // alert(1);
13             window.location.href = 'http://www.tmall.com';
14         }
15 
16 
17        btn.addEventListener('click', function (ev1) {
18            alert(0);
19        });
20 
21         btn.addEventListener('click', function (ev1) {
22             alert(1);
23         });
24 
25         btn.addEventListener('click', function (ev1) {
26             alert(2);
27         })
28     }

0 1 2 跳转页面