求问一个函数语句的意思用法

ifengjh

treenode involved = /** \n实体: *//***tag:involved*//**/item/**/;
string labelname = /** \n标签: *//***tag:labelname*//**/"newlabel"/**/;
double newvalue = /** \n值: *//***tag:newvalue*//**/duniform(1,3)/**/;

setnodenum(assertlabel(involved,labelname,DATATYPE_NUMBER),newvalue);}
//******* PickOption End *******\\

发生器创建触发中“创建和初始化标签”中的代码，并没有看懂treenode involved = item;和setnodenum(assertlabel(involved,labelname,DATATYPE_NUMBER),newvalue);} 语句，哪位大神给解释一下呢，谢谢了

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