feat(Field): improve number keyboard

src/stepper/index.js

@@ -290,13 +290,11 @@ export default createComponent({
           {...createListeners('minus')}
         />
         <input
-          type="number"
+          type={this.integer ? 'tel' : 'number'}
           role="spinbutton"
           class={bem('input')}
           // set keyboard in mordern browers
           inputmode={this.integer ? 'numeric' : 'decimal'}
-          // set keyboard in iOS 8 ~ 12
-          pattern={this.integer ? '\\d*' : null}
           value={this.currentValue}
           style={this.inputStyle}
           disabled={this.disabled}