更新

src/utils/directive.js

@@ -0,0 +1,18 @@
+import Vue from "vue";
+
+Vue.directive("checkNum", {
+  update(el, binding, vNode) {
+    if (el.children.length) {
+      let val = el.children[0].value;
+      let qualifiedNum = val
+        .replace(/[^\d.]/g, "")
+        .replace(/^\./g, "")
+        .replace(/\.{2,}/g, ".")
+        .replace(/^0{2,}/g, "0")
+        .replace(".", "$#$")
+        .replace(/\./g, "")
+        .replace("$#$", ".");
+      vNode.componentInstance.$emit("input", qualifiedNum);
+    }
+  },
+});