[bugfix] Filed number type value filter (#386)

packages/field/index.vue

@@ -29,6 +29,7 @@
       class="van-field__control"
       :type="type"
       :value="value"
+      @keypress="onKeypress"
       @input="onInput"
       @focus="$emit('focus')"
       @blur="$emit('blur')"
@@ -111,6 +112,17 @@ export default {
       this.onIconClick();
     },
 
+    onKeypress(event) {
+      if (this.type === 'number') {
+        const { keyCode } = event;
+        const allowPoint = this.value.indexOf('.') === -1;
+        const isValidKey = (keyCode >= 48 && keyCode <= 57) || (keyCode === 46 && allowPoint);
+        if (!isValidKey) {
+          event.preventDefault();
+        }
+      }
+    },
+
     adjustSize() {
       const el = this.$refs.textarea;
       el.style.height = 'auto';