function getCookie(c_name) {
        if(document.cookie.length > 0) {
            c_start = document.cookie.indexOf(c_name + "=");//获取字符串的起点
            if(c_start != -1) {
                c_start = c_start + c_name.length + 1;//获取值的起点
                c_end = document.cookie.indexOf(";", c_start);//获取结尾处
                if(c_end == -1) c_end = document.cookie.length;//如果是最后一个,结尾就是cookie字符串的结尾
                return decodeURI(document.cookie.substring(c_start, c_end));//截取字符串返回
            }
        }
        return "";
    }

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