fix lint

lib/pen.js

@@ -161,7 +161,7 @@ export default class Painter {
         // this.ctx.setFontSize(view.css.fontSize.toPx());
         // 计算行数
         let lines = 0;
-        let linesArray=[];
+        const linesArray = [];
         for (let i = 0; i < textArray.length; ++i) {
           const textLength = this.ctx.measureText(textArray[i]).width;
           const partWidth = view.css.width ? view.css.width.toPx() : textLength;
@@ -363,7 +363,7 @@ export default class Painter {
       lines,
       lineHeight,
       textArray,
-      linesArray
+      linesArray,
     } = extra;
     // 如果设置了id，则保留 text 的长度
     if (view.id) {