本文实例讲述了JS实现一个按钮的方法。分享给大家供大家参考。具体实现方法如下：
<!doctype html> <html> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="edge"> <script> window.onload = function(){ var btn = new Btn(); btn.init({width:300}); bindEvent(btn,'show',function(){ alert(1); }) bindEvent(btn,'click',function(){ alert(2); }) var oBtn = document.getElementById('btn'); oBtn.onclick = function (){ fireEvent(btn,'show'); } } function Btn(){ this.btn= null; this.settings = { width:200, height:40, borderRadius:6, text :'按钮' }; } Btn.prototype.init = function (opt){ extend(this.settings,opt); this.creat(); } Btn.prototype.creat = function (){ this.btn =document.createElement('div'); document.body.appendChild(this.btn); this.btn.innerHTML = this.settings.text; this.setData(); } Btn.prototype.destory = function (){ document.body.removeChild(this.btn); } Btn.prototype.setData = function (){ this.btn.style.width = this.settings.width +'px'; this.btn.style.height = this.settings.height +'px'; this.btn.style.border ='solid #f00 '+ this.settings.borderRadius +'px'; } function extend(obj1,obj2){ for(var attr in obj2){ obj1[attr] = obj2[attr]; } } function bindEvent(obj,events,fn){ obj.listeners = obj.listeners || {}; obj.listeners[events] = obj.listeners[events] || []; obj.listeners[events].push( fn ); if(obj.nodeType){ if(obj.addEventListener){ obj.addEventListener(events,fn,false); }else{ obj.attachEvent('on'+events,fn); } } } function fireEvent (obj,events){ if(obj.listeners[events]){ for(var i in obj.listeners[events]){ obj.listeners[events][i](); } } } </script> </head> <body> <a id="btn" style="margin-top: 40px;" >12</a> </body> </html>希望本文所述对大家的javascript程序设计有所帮助。