encodeURIComponent(v))编码的时候如果v==null的话,编码成了字符串null

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encodeURIComponent(v))编码的时候如果v==null的话,编码成了字符串null 官网源码: $.param = function(obj, traditional) { var params = []; params.add = function(k, v) { this.push(encodeURIComponent(k) + '=' + encodeURIComponent(v)); }; serialize(params, obj, traditional); return params.join('&').replace(/%20/g, '+'); };

建议修改 this.push(encodeURIComponent(k) + '=' + (v == null ? "" : encodeURIComponent(v)));