奇怪的json Unexpected character

是这样的，在做一个测试接口的时候，有一串数据怎么也传不过去，不知道是什么问题

json数据：

{"CatalogIds":null,"EnclosureName":null,"EnclosureNum":"1","EnclosureVersion":null,"ListId":"11","EnclosureProductList":[{"BidQuantity":"1 ","BiddingParamSpecs":"","BrandRecommend":"lemuse、L-Acoustics、ENEWAVE","Changes":"变更增加","ContractParamSpecs":"","DeepenParamSpecs":"：3.46 V@26dB，2.46 V@29dB，2.0 V@32dB，1.42 V@35dB；\n最大输入电平：20dBu\n频率响应：20Hz-20KHz（+/-0.5dB）用于1W@8欧；\n信噪比：>108 dB/A（20-20K Hz A加权）；\n串扰：典型-70dB@1 KHz；\n电压转换速率@8欧：>50V/μs 输入滤波器旁通；\n阻尼系数@8欧：>500@20-100Hz；\n总谐波失真+噪声(THD+N)：<0.1%从1W到全功率(典型的<0.05%)；\nDIM100 互调失真(IMD)：<0.05%从1W到全功率；\n最大输出V/A：100V峰值/45A真有效值；\n电源要求：通用输入，稳压输出，带功率因数矫正，过压保护\n标称电压（±10%）：100-240 V @ 50-60Hz\n功率因数cos(φ)：大于0.95 从500W到全功率；\n使用环境温度：-10° - 45° C / 14° - 113° F；\n外部尺寸：483 x 44.5 x 358 mm/19.0 x 1.75 x 14.1 in；\n重量：6.8 Kg (15 lb)\n","DeepenQuantity":"1 ","DrawingNo":"YX-01-001~YX-03-005","DrawingQuantities":"1 ","EnclosureId":null,"Id":null,"InstallMode":"机柜安装","InstallPosition":"户外机柜1","ListCatalogFullAddr":null}]}

但是如果删除部分内容，只留下

{"CatalogIds":null,"EnclosureName":null,"EnclosureNum":"1","EnclosureVersion":null,"ListId":"11","EnclosureProductList":[{"BidQuantity":"1 ","BiddingParamSpecs":"","BrandRecommend":"lemuse、L-Acoustics、ENEWAVE","Changes":"变更增加","ContractParamSpecs":"","DeepenParamSpecs":"","DeepenQuantity":"1 ","DrawingNo":"YX-01-001~YX-03-005","DrawingQuantities":"1 ","EnclosureId":null,"Id":null,"InstallMode":"机柜安装","InstallPosition":"户外机柜1","ListCatalogFullAddr":null}]}

却能成功发送请求

json解析出错。如果json没问题。那就是后端解析程序有问题。

字符串的格式不对，解析成json对象的时候挂掉了，检查一下是不是有特殊字符