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fix extra param problem
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docs/nodejs-sdk-v7.md

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@@ -199,12 +199,12 @@ var uploadToken=putPolicy.uploadToken(mac);
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<a id="param-uptoken"></a>
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#### 带自定义参数的凭证
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七牛支持客户端上传文件的时候定义一些自定义参数,这些参数可以在`returnBody``callbackBody`里面和七牛内置支持的魔法变量(即系统变量)通过相同的方式来引用。这些自定义的参数名称必须以`x:`开头。例如客户端上传的时候指定了自定义的参数`x:user``x:age`分别是`string``int`类型。那么可以通过下面的方式引用:
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七牛支持客户端上传文件的时候定义一些自定义参数,这些参数可以在`returnBody``callbackBody`里面和七牛内置支持的魔法变量(即系统变量)通过相同的方式来引用。这些自定义的参数名称必须以`x:`开头。例如客户端上传的时候指定了自定义的参数`x:name``x:age`分别是`string``int`类型。那么可以通过下面的方式引用:
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```
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var options = {
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//其他上传策略参数...
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returnBody: '{"key":"$(key)","hash":"$(etag)","fsize":$(fsize),"bucket":"$(bucket)","name":"$(x:name)"}'
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returnBody: '{"key":"$(key)","hash":"$(etag)","fsize":$(fsize),"bucket":"$(bucket)","name":"$(x:name)","age":$(x:age)}'
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}
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```
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@@ -213,7 +213,7 @@ var options = {
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```
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var options = {
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//其他上传策略参数...
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callbackBody: '{"key":"$(key)","hash":"$(etag)","fsize":$(fsize),"bucket":"$(bucket)","name":"$(x:name)"}',
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callbackBody: '{"key":"$(key)","hash":"$(etag)","fsize":$(fsize),"bucket":"$(bucket)","name":"$(x:name)","age":$(x:age)}',
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}
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```
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