百度HI网页版的PSOT数据sign值怎么取到

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求教  百度HI网页版的PSOT数据sign值怎么取到  ，百度hi网页版的地址是 http://web.im.baidu.com/
每次提交sign值都变了，应该是被加密了 ，但我不知道怎么取这个值，求教了。

第一次提交数据 v=30&seq=21&session=&source=22&guid=hcsz7vyf&from=灏忚阿澶忓?&body=%3Cmsg%3E%3Cfont%20n%3D%22%E5%AE%8B%E4%BD%93%22%20s%3D%2210%22%20b%3D%220%22%20i%3D%220%22%20ul%3D%220%22%20c%3D%220%22%2F%3E%3Ctext%20c%3D%22111%22%2F%3E%3C%2Fmsg%3E&to=ronanj&friend=false&&&rn=0.1951208577720953&sign=4b5ea4aa265487dec58e1ddaf3476bdf

第二次提交数据 v=30&seq=23&session=&source=22&guid=hcsz7vyf&from=灏忚阿澶忓?&body=%3Cmsg%3E%3Cfont%20n%3D%22%E5%AE%8B%E4%BD%93%22%20s%3D%2210%22%20b%3D%220%22%20i%3D%220%22%20ul%3D%220%22%20c%3D%220%22%2F%3E%3Ctext%20c%3D%22222%22%2F%3E%3C%2Fmsg%3E&to=ronanj&friend=false&&&rn=0.30139016065311813&sign=595a0d21c871dc46674601e02f1c6cad

第三次提交数据 v=30&seq=24&session=&source=22&guid=hcsz7vyf&from=灏忚阿澶忓?&body=%3Cmsg%3E%3Cfont%20n%3D%22%E5%AE%8B%E4%BD%93%22%20s%3D%2210%22%20b%3D%220%22%20i%3D%220%22%20ul%3D%220%22%20c%3D%220%22%2F%3E%3Ctext%20c%3D%22333%22%2F%3E%3C%2Fmsg%3E&to=ronanj&friend=false&&&rn=0.18195645942668448&sign=0416020498f269ae54c7a404bac738f3

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恩  昨晚已经找到了 ，谢谢回复

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