task2 重命名变量

length/src/index.js

@@ -16,31 +16,31 @@ export class Length {
     return this.unit
   }
   parseTo(unitNode) {
-    let len = this
+    let unitLength = this
     if (this.unit === 'yard') {
       if (unitNode === 'f') {
-        len = new Length(this.value * 3, unitNode)
+        unitLength = new Length(this.value * 3, unitNode)
       } else if (unitNode === 'inch') {
-        len = new Length(this.value * 36, unitNode)
+        unitLength = new Length(this.value * 36, unitNode)
       }
     }
 
     if (this.unit === 'inch') {
       if (unitNode === 'yard') {
-        len = new Length(this.value / 36, unitNode)
+        unitLength = new Length(this.value / 36, unitNode)
       } else if (unitNode === 'f') {
-        len = new Length(this.value / 12, unitNode)
+        unitLength = new Length(this.value / 12, unitNode)
       }
     }
 
     if (this.unit === 'f') {
       if (unitNode === 'yard') {
-        len = new Length(this.value / 3, unitNode)
+        unitLength = new Length(this.value / 3, unitNode)
       } else if (unitNode === 'inch') {
-        len = new Length(this.value * 12, unitNode)
+        unitLength = new Length(this.value * 12, unitNode)
       }
     }
 
-    return len
+    return unitLength
   }
 }