getElement方法封装

 1    var get = {
 2         byId: function(id) {
 3             return document.getElementById(id)
 4         },
 5         byClass: function(sClass, oParent) {
 6             var aClass = [];
 7             var reClass = new RegExp("(^| )" + sClass + "( |$)");
 8             var aElem = this.byTagName("*", oParent);
 9             for (var i = 0; i < aElem.length; i++) reClass.test(aElem[i].className) && aClass.push(aElem[i]);
10             return aClass
11         },
12         byTagName: function(elem, obj) {
13             return (obj || document).getElementsByTagName(elem)
14         }
15     };

 

转载于:https://www.cnblogs.com/linsimei/p/7201952.html