js 根据相对路径url获得完整路径url

自定义方法 GetPath(url)

///根据相对路径得到完整URL

///strUrl:URL相对地址

var GetPath = function (strUrl) {

    if (strUrl.toLowerCase().indexOf("https:") != -1 || strUrl.toLowerCase().indexOf("http:") != -1 || strUrl.toLowerCase().indexOf("file:") != -1) {

        return strUrl;

    }

    var strHref = window.location.href.split("/")[0] + "//" + window.location.host;

    if (strUrl.indexOf("/") == 0 || strUrl.indexOf("~/") == 0) {

        strUrl = strHref + strUrl.replace("~/", "/");

    }

    else {

        var arrHref = window.location.pathname.split("/");//获取当前的相对路径级

        var intBackNum = 1;

        //对../进行退级计算

        var strBack = "../";

        while (strUrl.indexOf(strBack) == 0) { //退回上一级目录

            strBack += strBack;

            intBackNum++;

        }

        //减去多余的../符

        if (intBackNum > 1) {

            strBack = strBack.replace("../", "");

        }

        strUrl = strUrl.replace(strBack, "");//替换退格符

        arrHref.length = arrHref.length - intBackNum;//减去路径级

        var strPath = arrHref.join("/");//组成路径

        var strSpace = (strPath.length == 0 ? "" : "/");

        strUrl = strHref + "/" + strPath + strSpace + strUrl;

    }

    return strUrl;

};