fix(NumberPicker): optimize delete value from 1.x to 1. while under control, close alibaba-fusion#3698 (alibaba-fusion#3700)

Author: weinianyang

src/number-picker/number-picker.jsx

@@ -211,7 +211,9 @@ class NumberPicker extends React.Component {
         if ('value' in nextProps && `${nextProps.value}` !== `${prevState.value}`) {
             const newValue = value === undefined || value === null ? '' : stringMode ? `${value}` : value;
             state.value = newValue;
-            state.displayValue = newValue;
+            if (Number(prevState.displayValue) !== nextProps.value) {
+                state.displayValue = newValue;
+            }
         }
 
         // 如果是undefined或null，应该不限制最大最小值
@@ -278,6 +280,7 @@ class NumberPicker extends React.Component {
         } else {
             this.setDisplayValue({ displayValue: this.state.value });
         }
+
         this.setFocus(false);
         const { onBlur } = this.props;
         onBlur && onBlur(e, ...args);

test/number-picker/index-spec.js

@@ -322,6 +322,24 @@ describe('number-picker', () => {
             done();
         });
 
+        it('onChange value 1.9 -> 1. should input displayValue === 1. onchange value === 1', done => {
+            const onChange = (value) => {
+                assert(value === 1)
+                done();
+            };
+            let wrapper = mount(
+                <NumberPicker value={1.9} onChange={onChange} precision={1} />
+            );
+            wrapper
+                .find('input')
+                .simulate('change', { target: { value: '1.' } });
+            assert(wrapper.find('input').prop('value') === "1.");
+            wrapper.setProps({value: 1});
+            assert(wrapper.find('input').prop('value') === "1.");
+            wrapper.find('input').simulate('blur');
+            assert(wrapper.find('input').prop('value') === 1);
+        })
+
         it('should leave out digits larger than precision set', done => {
             let wrapper = mount(
                 <NumberPicker defaultValue={0} precision={1} />
@@ -459,7 +477,7 @@ describe('number-picker', () => {
             wrapper
                 .find('input')
                 .simulate('change', { target: { value: '20' } });
-            assert(wrapper.find('input').prop('value') === 20);
+            assert(wrapper.find('input').prop('value') === '20');
             wrapper.find('input').simulate('blur');
             assert(wrapper.find('input').prop('value') === 20);
 
@@ -588,7 +606,6 @@ describe('number-picker', () => {
             assert(wrapper.find('input').prop('value') == '-0.');
             wrapper.find('input').simulate('blur');
             assert(wrapper.find('input').prop('value') == '-0');
-            // 值实际无变化，不触发onChange
             assert(onChange.calledOnce);
 
             wrapper = mount(