个人js类库mycool

// JavaScript Document Sunbye 1.0
    //getElementById
    //function start
    var $=function(_id){return document.getElementById(_id)};
    //function end
    //function start
    function byClass(classname){
        if(document.getElementsByClassName){ //判断是否为火狐浏览器，也可用document.all判断是IE
            return document.getElementsByClassName(classname);
        }else{
            var tags=document.getElementsByTagName("*");
            var tagslength=tags.length;
            var gettags=[];
            for(var i=0;i<tagslength;i++){
                if(tags[i].className==classname){
                    gettags.push(tags[i]);
                }
            }
            return gettags;
        }
    }
    //function end
    //function start
    function inputSearch(tagid,prompttxt,colorfocus,colorblur){
        tagid=document.getElementById(tagid);
        tagid.value=prompttxt;
        tagid.style.color=colorblur;
        tagid.onfocus=function(){
            if(this.value==prompttxt){
                this.value="";
                this.style.color=colorfocus;
            }
        };
        tagid.onblur=function(){
            if(this.value==""){
                this.value=prompttxt;
                tagid.style.color=colorblur;
            }else{
                this.style.color=colorfocus;
            }
        };
    }
    //function end
    //function start
    function fadeOut(ele,speed){
        var ele=document.getElementById(ele);
        var opacitynum=ele.style.opacity||1;
        var speed=(speed/100)||10;
        function opacityOff(){
            if(opacitynum>0){
                ele.style.opacity=opacitynum=(opacitynum-0.01).toFixed(2);
            }else{
                clearInterval(opacityt);
            }
        }
        var opacityt=setInterval(opacityOff,speed);
    }
    //function end
    //function start
    function fadeIn(ele,speed){
        var ele=document.getElementById(ele);
        var opacitynum=ele.style.opacity||0;
        var speed=(speed/100)||10;
        function opacityAdd(){
            if(opacitynum<1){
                ele.style.opacity=opacitynum=(parseFloat(opacitynum)+0.01).toFixed(2);
            }else{
                clearInterval(opacityt);
            }
        }
        var opacityt=setInterval(opacityAdd,speed);
    }
    //function end
    //function start
    function hasClass(obj,cls){  
        return obj.className.match(new RegExp('(\\s|^)' + cls + '(\\s|$)'));  
    } 
    function addClass(obj,cls){ 
        if(!this.hasClass(obj,cls)) obj.className += " " + cls;  
    }  
    function removeClass(obj,cls){  
        if(hasClass(obj,cls)) {  
            var reg=new RegExp('(\\s|^)'+cls+'(\\s|$)');  
            obj.className=obj.className.replace(reg,' ');  
        }  
    }  
    //function end