Euler: Default value for ES6. (#21961)

Author: linbingquan

src/math/Euler.js

@@ -69,12 +69,12 @@ class Euler {
 
 	}
 
-	set( x, y, z, order ) {
+	set( x, y, z, order = this._order ) {
 
 		this._x = x;
 		this._y = y;
 		this._z = z;
-		this._order = order || this._order;
+		this._order = order;
 
 		this._onChangeCallback();
 
@@ -101,7 +101,7 @@ class Euler {
 
 	}
 
-	setFromRotationMatrix( m, order, update ) {
+	setFromRotationMatrix( m, order = this._order, update = true ) {
 
 		// assumes the upper 3x3 of m is a pure rotation matrix (i.e, unscaled)
 
@@ -110,8 +110,6 @@ class Euler {
 		const m21 = te[ 1 ], m22 = te[ 5 ], m23 = te[ 9 ];
 		const m31 = te[ 2 ], m32 = te[ 6 ], m33 = te[ 10 ];
 
-		order = order || this._order;
-
 		switch ( order ) {
 
 			case 'XYZ':
@@ -230,7 +228,7 @@ class Euler {
 
 		this._order = order;
 
-		if ( update !== false ) this._onChangeCallback();
+		if ( update ) this._onChangeCallback();
 
 		return this;
 
@@ -244,9 +242,9 @@ class Euler {
 
 	}
 
-	setFromVector3( v, order ) {
+	setFromVector3( v, order = this._order ) {
 
-		return this.set( v.x, v.y, v.z, order || this._order );
+		return this.set( v.x, v.y, v.z, order );
 
 	}