task- 重命名，通过第一次测试

length/src/index.js

 export class Length {
   value
   unit
-  unitEnum = ['foot', 'yard', 'inch']
+  // unitEnum = ['foot', 'yard', 'inch']
 
   constructor(val, uint) {
     this.value = val
@@ -15,29 +15,29 @@ export class Length {
   getUint() {
     return this.unit
   }
-  parseTo(u) {
+  parseTo(unitNode) {
     let len = this
     if (this.unit === 'yard') {
-      if (u === 'f') {
-        len = new Length(this.value * 3, u)
-      } else if (u === 'inch') {
-        len = new Length(this.value * 36, u)
+      if (unitNode === 'f') {
+        len = new Length(this.value * 3, unitNode)
+      } else if (unitNode === 'inch') {
+        len = new Length(this.value * 36, unitNode)
       }
     }
 
     if (this.unit === 'inch') {
-      if (u === 'yard') {
-        len = new Length(this.value / 36, u)
-      } else if (u === 'f') {
-        len = new Length(this.value / 12, u)
+      if (unitNode === 'yard') {
+        len = new Length(this.value / 36, unitNode)
+      } else if (unitNode === 'f') {
+        len = new Length(this.value / 12, unitNode)
       }
     }
 
     if (this.unit === 'f') {
-      if (u === 'yard') {
-        len = new Length(this.value / 3, u)
-      } else if (u === 'inch') {
-        len = new Length(this.value * 12, u)
+      if (unitNode === 'yard') {
+        len = new Length(this.value / 3, unitNode)
+      } else if (unitNode === 'inch') {
+        len = new Length(this.value * 12, unitNode)
       }
     }