ie9以下的浏览器兼容性问题

.bind不兼容的问题
Function.prototype.bind = function () {
    var fn = this, args = Array.prototype.slice.call(arguments), object = args.shift();
    return function () {
        return fn.apply(object,
            args.concat(Array.prototype.slice.call(arguments)));
    };
};

 
.getElementsByClassName 不兼容的问题

var getElementsByClassName = function (searchClass, node, tag) {
    var result = [];
    if (document.getElementsByClassName) {
        var nodes = (node || document).getElementsByClassName(searchClass);
        for (var i = 0; node = nodes[i++];) {
            if (tag !== "*" && node.tagName === tag.toUpperCase()) {
                result.push(node)
            }
        }
        return result
    } else {
        node = node || document;
        tag = tag || "*";
        var classes = searchClass.split(" "),
            elements = (tag === "*" && node.all) ? node.all : node.getElementsByTagName(tag),
            patterns = [],
            current,
            match;
        var i = classes.length;
        while (--i >= 0) {
            patterns.push(new RegExp("(^|\\s)" + classes[i] + "(\\s|$)"));
        }
        var j = elements.length;
        while (--j >= 0) {
            current = elements[j];
            match = false;
            for (var k = 0, kl = patterns.length; k < kl; k++) {
                match = patterns[k].test(current.className);
                if (!match)  break;
            }
            if (match) result.push(current);
        }
        return result;
    }
}

addEventListener不兼容的问题

function myAddEvent(obj, ev, fn) {
    if (obj.attachEvent) {
        obj.attachEvent("on" + ev, fn);
    }
    else {
        obj.addEventListener(ev, fn, false);
    }
}

.map不兼容的问题
Array.prototype.myMap = function (fn, context) {
    context = context || window;
    var ary = [];
    if (Array.prototype.map) {
        ary = this.map(fn, context);
    } else {
        for (var i = 0; i < this.length; i++) {
            ary[i] = fn.apply(context, [this[i], i, this]);
        }
    }
    return ary;
}

e.stopPropagation的兼容性问题

function stopPropagation(){

e = window.event || e;
if (document.all) {  //只有ie识别
    e.cancelBubble = true;
} else {
    e.stopPropagation();
}
}

e.currentTarget的兼容性问题修复如下:

var userAgent = navigator.userAgent; //取得浏览器的userAgent字符串
var isOpera = userAgent.indexOf("Opera") > -1; //判断是否Opera浏览器
var isIE = userAgent.indexOf("compatible") > -1 && userAgent.indexOf("MSIE") > -1 && !isOpera; //判断是否IE浏览器
if (isIE) {
    var reIE = new RegExp("MSIE (\\d+\\.\\d+);");
    reIE.test(userAgent);
    var fIEVersion = parseFloat(RegExp["$1"]);
    if (fIEVersion == 7 || fIEVersion == 8) {
        e=e.srcElement.parentElement;
    }else{
        e=e.currentTarget;
    }
}else{
    e=e.currentTarget;
}