fix: get options props

components/_util/props-util.js

@@ -1,14 +1,12 @@
 import isPlainObject from 'lodash/isPlainObject';
 import classNames from 'classnames';
 import { isVNode } from 'vue';
+import { camelize, hyphenate, isOn, resolvePropValue } from './util';
 // function getType(fn) {
 //   const match = fn && fn.toString().match(/^\s*function (\w+)/);
 //   return match ? match[1] : '';
 // }
 
-const onRE = /^on[^a-z]/;
-export const isOn = key => onRE.test(key);
-
 const splitAttrs = attrs => {
   const allAttrs = Object.keys(attrs);
   const eventAttrs = {};
@@ -25,10 +23,6 @@ const splitAttrs = attrs => {
   }
   return { onEvents, events: eventAttrs, extraAttrs };
 };
-const camelizeRE = /-(\w)/g;
-const camelize = str => {
-  return str.replace(camelizeRE, (_, c) => (c ? c.toUpperCase() : ''));
-};
 const parseStyleText = (cssText = '', camel) => {
   const res = {};
   const listDelimiter = /;(?![^(]*\))/g;
@@ -101,17 +95,19 @@ const getOptionProps = instance => {
     const props = instance.$.vnode.props || {};
     Object.keys(instance.$props).forEach(k => {
       const v = instance.$props[k];
-      if (v !== undefined || k in props) {
+      const hyphenateKey = hyphenate(k);
-        res[k] = k in props ? props[k] : v;
+      if (v !== undefined || hyphenateKey in props) {
+        res[k] = v; // 直接取 $props[k]
       }
     });
   } else if (isVNode(instance) && typeof instance.type === 'object') {
     const props = instance.props || {};
-    const allProps = instance.type.props;
+    const options = instance.type.props;
-    Object.keys(allProps).forEach(k => {
+    Object.keys(options).forEach(k => {
-      const v = allProps[k].default;
+      const hyphenateKey = hyphenate(k);
-      if (v !== undefined || k in props) {
+      const v = resolvePropValue(options, props, k, props[hyphenateKey], hyphenateKey);
-        res[k] = k in props ? props[k] : v;
+      if (v !== undefined || hyphenateKey in props) {
+        res[k] = v;
       }
     });
   }

components/_util/util.js

@@ -0,0 +1,51 @@
+const isFunction = val => typeof val === 'function';
+const onRE = /^on[^a-z]/;
+const isOn = key => onRE.test(key);
+
+const cacheStringFunction = fn => {
+  const cache = Object.create(null);
+  return str => {
+    const hit = cache[str];
+    return hit || (cache[str] = fn(str));
+  };
+};
+const camelizeRE = /-(\w)/g;
+const camelize = cacheStringFunction(str => {
+  return str.replace(camelizeRE, (_, c) => (c ? c.toUpperCase() : ''));
+});
+
+const hyphenateRE = /\B([A-Z])/g;
+const hyphenate = cacheStringFunction(str => {
+  return str.replace(hyphenateRE, '-$1').toLowerCase();
+});
+
+const capitalize = cacheStringFunction(str => {
+  return str.charAt(0).toUpperCase() + str.slice(1);
+});
+
+const hasOwnProperty = Object.prototype.hasOwnProperty;
+const hasOwn = (val, key) => hasOwnProperty.call(val, key);
+
+// change from vue sourcecode
+function resolvePropValue(options, props, key, value, hyphenateKey) {
+  const opt = options[key];
+  if (opt != null) {
+    const hasDefault = hasOwn(opt, 'default');
+    // default values
+    if (hasDefault && value === undefined) {
+      const defaultValue = opt.default;
+      value = opt.type !== Function && isFunction(defaultValue) ? defaultValue() : defaultValue;
+    }
+    // boolean casting
+    if (opt[0 /* shouldCast */]) {
+      if (!hasOwn(props, hyphenateKey) && !hasDefault) {
+        value = false;
+      } else if (opt[1 /* shouldCastTrue */] && (value === '' || value === hyphenateKey)) {
+        value = true;
+      }
+    }
+  }
+  return value;
+}
+
+export { isOn, cacheStringFunction, camelize, hyphenate, capitalize, resolvePropValue };