//attrName 实体的属性名 value 实体该属性名包含的字符串
removeEntities(attrName,value){
if(!attrName){Viewer.entities.removeAll();return;}
if(Viewer.entities){
for(var n=Viewer.entities.values.length-1;n>=0;n--){
if(Viewer.entities.values[n][attrName]&&Viewer.entities.values[n][attrName].indexOf(value)!=-1){
Viewer.entities.remove(Viewer.entities.values[n]);
}
}
}
}