diff --git a/src/main/java/com/jfinal/template/expr/ast/Assign.java b/src/main/java/com/jfinal/template/expr/ast/Assign.java
index e777dc8..aae10ce 100644
--- a/src/main/java/com/jfinal/template/expr/ast/Assign.java
+++ b/src/main/java/com/jfinal/template/expr/ast/Assign.java
@@ -70,6 +70,23 @@ public class Assign extends Expr {
 		this.location = location;
 	}
 	
+	/**
+	 * 获取 assign 表达式左侧标识符 id
+	 * 在自定义指令中得到 id 值，可以得知该赋值表达式是针对哪个变量在操作，有助于扩展
+	 * 需求来源：http://www.jfinal.com/share/379
+	 */
+	public String getId() {
+		return id;
+	}
+	
+	public Expr getIndex() {
+		return index;
+	}
+	
+	public Expr getRight() {
+		return right;
+	}
+	
 	/**
 	 * 赋值语句有返回值，可以用于表达式计算
 	 */