逐步完成前后端服务器

frontend/node_modules/zrender/lib/animation/cubicEasing.js

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+import { cubicAt, cubicRootAt } from '../core/curve.js';
+import { trim } from '../core/util.js';
+var regexp = /cubic-bezier\(([0-9,\.e ]+)\)/;
+export function createCubicEasingFunc(cubicEasingStr) {
+    var cubic = cubicEasingStr && regexp.exec(cubicEasingStr);
+    if (cubic) {
+        var points = cubic[1].split(',');
+        var a_1 = +trim(points[0]);
+        var b_1 = +trim(points[1]);
+        var c_1 = +trim(points[2]);
+        var d_1 = +trim(points[3]);
+        if (isNaN(a_1 + b_1 + c_1 + d_1)) {
+            return;
+        }
+        var roots_1 = [];
+        return function (p) {
+            return p <= 0
+                ? 0 : p >= 1
+                ? 1
+                : cubicRootAt(0, a_1, c_1, 1, p, roots_1) && cubicAt(0, b_1, d_1, 1, roots_1[0]);
+        };
+    }
+}