15-1 兼容总结

//1.scrollTop

document.documentElement.scrollTop || document.body.scrollTop

//2.scrollLeft

document.documentElement.scrollLeft || document.body.scrollLeft

//byClassName
//3.兼容byClassName

function byClassName(obj,className){
    if(obj.getElementsByClassName){
        return obj.getElementsByClassName(className);
    }else{
        var arr = [];
        var ele = obj.getElementsByTagName('*');
        for(var i = 0,len = ele.length;i < len;i ++){
            if(ele[i].className == className){
                arr.push(ele[i]);
            }
        }
        return arr;
    }
}

//4.获取对象中class属性值的兼容

//getAttribute('class') ie8以下 返回null
//oDiv.getAttribute('className') : 除ie8以下支持，其它都返回null
var className = oDiv.getAttribute('className') ? oDiv.getAttribute('className') : oDiv.getAttribute('class');

//5.获取非行内样式

function getStyle(obj,attr){
    return obj.currentStyle ? obj.currentStyle[attr] : getComputedStyle(obj,1)[attr];
}

//6.获取事件对象的兼容

var e = 形参 || window.event;

//7.获取鼠标按键编码值的兼容

function getButton(evt){
//              evt = evt || window.event;
    var e = evt || window.event;
    if(evt){
        return e.button;
    }else if(window.event){
        switch(e.button){
            case 1 : return 0;
            case 4 : return 1;
            case 2 : return 2;
        }
    }
}

//8.通过onkeypress获取键盘按键编码值的兼容

event.keyCode || event.which || event.charCode

//9.阻止事件冒泡的兼容

e.stopPropagation ? e.stopPropagation() : e.cancelBubble = true;

//10.阻止超链接的默认行为的兼容

e.preventDefault ? e.preventDefault() : e.returnValue = false;

//11.添加事件监听器的兼容

function addEventListen(obj,evt,fun,boo){
    if(obj.attachEvent){
        
        obj.attachEvent('on' + evt,fun);
    }else{
        obj.addEventListener(evt,fun,boo);
    }
}

//12.删除事件监听器的兼容

function removeEventListen(obj,evt,fn,boo){
    if(obj.removeEventListener){
        obj.removeEventListener(evt,fn,boo);
    }else{
        obj.detachEvent('on' + evt,fn);
    }
}

//13.获取事件源的兼容

var target = e.target || e.srcElement;

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