js

1.js中判断字符串是否为json

function isJSONOrObject(str) {
    if (typeof str == 'string') {
        try {
            var obj = JSON.parse(str);
            if (typeof obj == 'object' && obj) {
                return true;
            } else {
                return false;
            }
        } catch (e) {
            return false;
        }
    }
    return true;
}

2.Jquery的$.ajax方法

(function($){  
    //备份jquery的ajax方法  
    var _ajax=$.ajax;  
      
    //重写jquery的ajax方法  
    $.ajax=function(opt){  
        //备份opt中error和success方法  
        var fn = {  
            error:function(XMLHttpRequest, textStatus, errorThrown){},  
            success:function(data, textStatus){}  
        }  
        if(opt.error){  
            fn.error=opt.error;  
        }  
        if(opt.success){  
            fn.success=opt.success;  
        }  
          
        //扩展增强处理  
        var _opt = $.extend(opt,{  
            error:function(XMLHttpRequest, textStatus, errorThrown){  
                //错误方法增强处理  
                  
                fn.error(XMLHttpRequest, textStatus, errorThrown);  
            },  
            success:function(data, textStatus){  
                //成功回调方法增强处理  
                  
                fn.success(data, textStatus);  
            }  
        });  
        _ajax(_opt);  
    };  
})(jQuery);  

var token = window.localStorage.getItem('tokenInfo');
var _ajax = $.ajax;
$.ajax = function(opt) {
    var fn = {
        error : function(XMLHttpRequest, textStatus, errorThrown) {
        },
        success : function(data, textStatus) {
        }
    };
    if (opt.error) {
        fn.error = opt.error;
    }
    if (opt.success) {
        fn.success = opt.success;
    }

    var _opt = $.extend(opt, {
        error : function(XMLHttpRequest, textStatus, errorThrown) {
            //if(XMLHttpRequest.status!==200){
            //    alert('数据接口报错,状态码:'+XMLHttpRequest.status+'')
            //}
            fn.error(XMLHttpRequest, textStatus, errorThrown);
        },
        success : function(data, textStatus, XMLHttpRequest) {
            if (isJSONOrObject(data)) {
                var res = JSON.parse(XMLHttpRequest.responseText);
                if (res.status == '40301' || res.status == '40101') {
                    if (window !== top) {
                        top.location.href = "login.html"
                    } else {
                        window.location.href = "login.html"
                    }
                }
            }
            fn.success(data, textStatus, XMLHttpRequest);
        },
        headers : {
            Authorization : token,
        // sid: sid
        }
    });
    return _ajax(_opt);
};