js

//事件捕获    function fun(ele,eve,handler,type){        if(ele.attachEvent){            ele.attachEvent("on"+eve,handler)        }else{            ele.addEventListener(eve,handler,type)        }    }//onclick    document.onclik = function(e){          var oEvent = e || event;        alert('x:'+oEvent.clientX + 'y:'+oEvent.clientY)            }//keydown    document.onkeydown = function(eve){     if(eve.keyCode){        alert(eve.keyCode)    }else{        alert(eve.which)        }    }//阻止冒泡    var e = e || window.event;      if ( e && e.stopPropagation ){          e.stopPropagation();      }else{          e.cancelBubble = true;      }//阻止默认事件    var olink = document.getElementById("link")    olink.onclick= function(e){        var e = e||window.event;        if(e && e.preventDefault){            e.preventDefault();        }else{            e.returnValue = false;        }    }//事件委托    oUl.onmouseover = function(e){          //为了兼容IE    var oEvent = e||window.event;     var target = oEvent.target|| oEvent.srcElement;      if(target.nodeName.toLowerCase() == 'li'){         target.style.background = 'red';          }        }//获取元素的样式    function getStyle (obj,style){        if(obj.currentStyle){            return obj.currentStyle[style]        }else{            return getComputedStyle(obj,false)[style];        }           }//封装getElementsByClassName    function getByClass(oParent,sClass){        var result = [];        var aEle = oParent.getElementsByTagName("*")   //元素无法确认，因此用*表示        for(var i=0;i<aEle.length;i++){            if(aEle[i].className ==sClass){                result.push(aEle[i])            }        }        return result    }    //封装 设置cookie    function setcookie(name,value,iday){        var oDate = new Date();        oDate.setDate(oDate.getDate()+iday);            document.cookie = name+ '='+value+'; expires='+oDate.toUTCString();    }//封装 删除cookie       function removecookie(name){        setcookie(name,1,-1)    }    //封装获取cookie    function getcookie(name){        var arr =document.cookie.split('; ');        for(var i=0;i<arr.length;i++){            var arr2 = arr[i].split('=');            if(arr2[0]==name){                alert(arr2[1])            }        }        return'false';    }//用jquery封装的ajax    function fun(option){    var type = option.type;    var url = option.url;    var judg = option.judg;    var success =option.success;    var xhr = null;    if(window.XMLHttpRequest){      xhr = new XMLHttpRequest();    }else{        xhr = new ActiveXObject("Microsoft.XMLHttp")    }    xhr.open(type,url,judg);    xhr.send();    xhr.onreadystatechange = function(){        if(xhr.readyState ==4){            if(xhr.status ==200){                success && success(JSON.parse(xhr.responseText));                   }        }    }}