修复单选/复选的状态

src/form/checkbox-item.wc

@@ -283,7 +283,7 @@ export default class Checkbox {
         if (k === 'readonly') {
           k = 'readOnly'
         }
-        this[k] = true
+        this[k] = val !== null
         break
     }
   }

src/form/checkbox.wc

@@ -117,13 +117,13 @@ export default class CheckboxGroup {
 
       case 'readonly':
       case 'disabled':
+        var k = name
+        if (k === 'readonly') {
+          k = 'readOnly'
+        }
         Array.from(this.children).forEach(it => {
           if (it.tagName === 'WC-CHECKBOX' && it.root) {
-            if (val === null) {
-              it.removeAttribute(name)
-            } else {
-              it.setAttribute(name, '')
-            }
+            it[k] = val !== null
           }
         })
         break

src/form/radio-item.wc

@@ -269,7 +269,7 @@ export default class Radio {
         if (k === 'readonly') {
           k = 'readOnly'
         }
-        this[k] = true
+        this[k] = val !== null
         break
     }
   }

src/form/radio.wc

@@ -104,13 +104,15 @@ export default class RadioGroup {
 
       case 'readonly':
       case 'disabled':
+        var k = name
+        if (k === 'readonly') {
+          k = 'readOnly'
+        }
+        console.log('变了', k, val, typeof val)
         Array.from(this.children).forEach(it => {
           if (it.tagName === 'WC-RADIO' && it.root) {
-            if (val === null) {
-              it.removeAttribute(name)
-            } else {
-              it.setAttribute(name, '')
-            }
+            it[k] = val !== null
+            console.log('-----', k, it[k], val !== null, '-----')
           }
         })
         break