// JavaScript Documentfunction myAddEvent(obj,sEv,fn){ ???alert(‘fn:‘+fn); ???if(obj.attachEvent){ ???????obj.attachEvent(‘on‘+sEv,fn); ???}else{ ???????obj.addEventListener(sEv,fn,false); ???}}/*getClassName 完整版*/function getClassName(oParent,sClass){ ???var aEle = oParent.getElementsByTagName(‘*‘); ???var iResult = []; ???/*一般如果需要传递参数就用new RegExp,不用//，//会把里面的所有内容都当场字符串*/ ???var re = new RegExp(‘\\b‘+sClass+‘\\b‘); ???for(var i=0;i<aEle.length;i++){ ???????if(re.test(aEle[i].className)){ ???????????iResult.push(aEle[i]); ???????} ???} ???return iResult;}function Vquery(vArg){ ???this.elements = []; ???switch(typeof vArg){ ???????case ‘function‘: ???????????????alert(111); ???????????????myAddEvent(window,‘load‘,vArg); ???????????break; ???????case ‘string‘: ???????????switch(vArg.charAt(0)){ ???????????????case ‘#‘://id ???????????????????var obj = document.getElementById(vArg.substring(1)); ???????????????????this.elements.push(obj); ???????????????????break; ???????????????case ‘.‘://class ???????????????????this.elements = getClassName(document,vArg.substring(1)); ???????????????????break; ???????????????default ???://tagname ???????????????????this.elements = document.getElementsByTagName(vArg); ???????????????????break; ???????????} ???????????break; ???????????????default: /*对象*/ ???????????break; ???????????????}}<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>无标题文档</title><script src=‘vQuery.js‘></script><script>window.onload = function(){ ???new Vquery(function(){ ???????alert(‘a‘); ???}); ???new Vquery(function(){ ???????alert(‘b‘); ???});};</script></head><body></body></html>js Vquery
原文地址：https://www.cnblogs.com/moon-yyl/p/9042768.html