🎈 perf(优化购物车):

src/components/counter/index copy.tsx

@@ -0,0 +1,136 @@
+import { Input, View } from '@tarojs/components'
+import { memo, useEffect, useMemo, useRef, useState } from 'react'
+import Big from 'big.js'
+import styles from './index.module.scss'
+type params = {
+  minNum?: number //最小值
+  maxNum?: number //最大值
+  step?: number //步长
+  defaultNum?: number //默认值
+  digits?: number //多少位小数
+  onChange?: (val: number) => void
+  onBlue?: (val: number) => void //失去焦点触发
+  onClickBtn?: (val: number) => void
+  unit?: string
+  disable?: true | false //是否禁用
+}
+export default memo((props: params) => {
+  return <Counter {...props}></Counter>
+})
+
+function areEqual(prevProps: params, nextProps: params) {
+  return (
+    prevProps.defaultNum == nextProps.defaultNum &&
+    prevProps.unit == nextProps.unit &&
+    prevProps.minNum == nextProps.minNum &&
+    prevProps.maxNum == nextProps.maxNum &&
+    prevProps.step == nextProps.step &&
+    prevProps.digits == nextProps.digits
+  )
+}
+const Counter = memo((props: params) => {
+  let { minNum = 0, maxNum = 10000, step = 1, digits = 0, defaultNum = 0, onChange, onBlue, onClickBtn, unit = '', disable = false } = props
+  const [value, setValue] = useState<any>({ count: defaultNum })
+  // useEffect(() => {
+  //   setValue({ count: defaultNum })
+  // }, [defaultNum])
+  console.log('1231231231231212')
+  const onPlus = () => {
+    if (disable) return false
+    let { count } = value
+    let num_res = Big(count).add(step).toNumber()
+    num_res = num_res >= maxNum ? maxNum : num_res
+    num_res = formatDigits(num_res)
+    // setValue({ ...value, count: num_res })
+    onChange?.(parseFloat(num_res))
+    onClickBtn?.(parseFloat(num_res))
+  }
+  const minus = () => {
+    if (disable) return false
+    let { count } = value
+    let num_res = Big(count).minus(step).toNumber()
+    num_res = num_res < minNum ? minNum : num_res
+    // setValue({ ...value, count: num_res })
+    onChange?.(parseFloat(num_res))
+    onClickBtn?.(parseFloat(num_res))
+  }
+
+  //保留小数
+  const formatDigits = (num) => {
+    num = num + ''
+    if (num.includes('.') && digits > 0) {
+      console.log('num::', num.includes('.'))
+      let res = num.split('.')
+      let last_num = res[1].substr(0, digits)
+      return res[0] + '.' + last_num
+    }
+    return parseFloat(num)
+  }
+
+  //检查数据
+  const checkData = (val) => {
+    let num = parseFloat(val)
+    if (num > maxNum) return maxNum
+    if (num < minNum) return minNum
+    return val
+  }
+
+  const onInputEven = (e) => {
+    // let res = e.detail.value
+    // if (res === '') {
+    //   // setValue({ ...value, count: minNum })
+    //   onChange?.(minNum)
+    // } else if (!isNaN(Number(res))) {
+    //   let count = formatDigits(res)
+    //   count = checkData(count)
+    //   // setValue({ ...value, count })
+    //   onChange?.(parseFloat(count as string))
+    // } else {
+    //   let num = parseFloat(res)
+    //   if (!isNaN(num)) {
+    //     let count = formatDigits(num)
+    //     count = checkData(count)
+    //     // setValue({ ...value, count })
+    //     onChange?.(count as number)
+    //   } else {
+    //     // setValue({ ...value, count: defaultNum })
+    //     onChange?.(defaultNum)
+    //   }
+    // }
+  }
+
+  const onBluerEven = (e) => {
+    let num = parseFloat(e.detail.value)
+    if (!isNaN(num)) {
+      let count = formatDigits(num)
+      count = checkData(count)
+      // setValue({ ...value, count })
+      onBlue?.(count as number)
+    } else {
+      // setValue({ ...value, count: defaultNum })
+      onBlue?.(minNum)
+    }
+  }
+  return (
+    <View className={styles.main}>
+      <View className={styles.reduce} onClick={() => minus()}>
+        -
+      </View>
+      <View className={styles.input}>
+        <Input
+          value={String(props.defaultNum)}
+          onInput={onInputEven}
+          onBlur={onBluerEven}
+          type='digit'
+          disabled={disable}
+          alwaysEmbed={true}
+          cursorSpacing={150}
+        />
+        <View className={styles.unit}>{unit}</View>
+      </View>
+      <View className={styles.plus} onClick={() => onPlus()}>
+        +
+      </View>
+    </View>
+  )
+}, areEqual)

src/components/counter/index.module.scss

@@ -1,46 +1,44 @@
-
-.main{
+.main {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  width: 100%;
+  .plus {
+    color: $color_main;
+    width: 46px;
+    height: 46px;
+    text-align: center;
+    line-height: 43px;
+    font-size: 50px;
+    background-color: $color_main;
+    color: #fff;
+    border-radius: 8px;
+  }
+  .reduce {
+    font-size: 50px;
+    width: 46px;
+    height: 46px;
+    text-align: center;
+    line-height: 43px;
+    color: #007aff;
+  }
+  .input {
     display: flex;
-    align-items: center;
-    justify-content: space-between;
-    width: 100%;
-    .plus{
-        color: $color_main;
-        width: 46px;
-        height: 46px;
-        text-align: center;
-        line-height: 43px;
-        font-size: 50px;
-        background-color: $color_main;
-        color: #fff;
-        border-radius: 8px;
-    }
-    .reduce {
-        font-size: 50px;
-        width: 46px;
-        height: 46px;
-        text-align: center;
-        line-height: 43px;
-        color:#007AFF;
-    }
-    .input{
-        display: flex;
-        align-items: flex-end;
-        background-color: #fff;
-        padding: 5px 10px;
-        box-sizing: border-box;
-        width: 106px;
-        border-radius: 10px;
-        input{
-            font-size: $font_size_medium;
-            text-align: right;
-            padding-right: 10px;
-        }
-    }
-    
-    .unit{
-        font-size: $font_size_min;
-        color: $color_font_two;
+    align-items: flex-end;
+    background-color: #fff;
+    padding: 5px 10px;
+    box-sizing: border-box;
+    width: 106px;
+    border-radius: 10px;
+    input {
+      font-size: $font_size_medium;
+      // text-align: right;
+      padding-right: 10px;
     }
+  }
 
+  .unit {
+    font-size: $font_size_min;
+    color: $color_font_two;
+  }
 }

src/components/counter/index.tsx

@@ -1,5 +1,5 @@
 import { Input, View } from '@tarojs/components'
-import { useEffect, useMemo, useRef, useState } from 'react'
+import { memo, useEffect, useMemo, useRef, useState } from 'react'
 import Big from 'big.js'
 import styles from './index.module.scss'
 type params = {
@@ -12,14 +12,21 @@ type params = {
   onBlue?: (val: number) => void //失去焦点触发
   onClickBtn?: (val: number) => void
   unit?: string
-  disable?: true | false //是否禁用
+  disabled?: true | false //是否禁用
 }
-export default ({ minNum = 0, maxNum = 10000, step = 1, digits = 0, defaultNum = 0, onChange, onBlue, onClickBtn, unit = '', disable = false }: params) => {
-  const [value, setValue] = useState<any>({ count: defaultNum })
+export default memo((props: params) => {
+  return <Counter {...props}></Counter>
+})
 
+const Counter = memo((props: params) => {
+  let { minNum = 0, maxNum = 10000, step = 1, digits = 0, defaultNum = 0, onChange, onBlue, onClickBtn, unit = '', disabled = false } = props
+  const [value, setValue] = useState<any>({ count: defaultNum })
+  useEffect(() => {
+    setValue({ count: defaultNum })
+  }, [defaultNum])
   const onPlus = () => {
-    if (disable) return false
-    let { count } = value
+    if (disabled) return false
+    let count = value.count
     let num_res = Big(count).add(step).toNumber()
     num_res = num_res >= maxNum ? maxNum : num_res
     num_res = formatDigits(num_res)
@@ -28,8 +35,8 @@ export default ({ minNum = 0, maxNum = 10000, step = 1, digits = 0, defaultNum =
     onClickBtn?.(parseFloat(num_res))
   }
   const minus = () => {
-    if (disable) return false
-    let { count } = value
+    if (disabled) return false
+    let count = value.count
     let num_res = Big(count).minus(step).toNumber()
     num_res = num_res < minNum ? minNum : num_res
     setValue({ ...value, count: num_res })
@@ -60,37 +67,40 @@ export default ({ minNum = 0, maxNum = 10000, step = 1, digits = 0, defaultNum =
   const onInputEven = (e) => {
     let res = e.detail.value
     if (res === '') {
-      setValue({ ...value, count: minNum })
+      // setValue({ ...value, count: minNum })
       onChange?.(minNum)
     } else if (!isNaN(Number(res))) {
       let count = formatDigits(res)
       count = checkData(count)
-      setValue({ ...value, count })
+      // setValue({ ...value, count })
       onChange?.(parseFloat(count as string))
     } else {
       let num = parseFloat(res)
       if (!isNaN(num)) {
         let count = formatDigits(num)
         count = checkData(count)
-        setValue({ ...value, count })
+        // setValue({ ...value, count })
         onChange?.(count as number)
       } else {
-        setValue({ ...value, count: defaultNum })
+        // setValue({ ...value, count: defaultNum })
         onChange?.(defaultNum)
       }
     }
   }
 
-  const onBluerEven = () => {
-    let num = parseFloat(value.count)
-    if (!isNaN(num)) {
+  const onBluerEven = (e) => {
+    let num = parseFloat(e.detail.value)
+    if (e.detail.value == '') {
+      onBlue?.(minNum)
+      setValue({ count: minNum })
+    } else if (!isNaN(num)) {
       let count = formatDigits(num)
       count = checkData(count)
-      setValue({ ...value, count })
+      setValue({ count })
       onBlue?.(count as number)
     } else {
-      setValue({ ...value, count: defaultNum })
-      onBlue?.(defaultNum)
+      setValue({ count: minNum })
+      onBlue?.(minNum)
     }
   }
   return (
@@ -99,7 +109,7 @@ export default ({ minNum = 0, maxNum = 10000, step = 1, digits = 0, defaultNum =
         -
       </View>
       <View className={styles.input}>
-        <Input value={String(value.count)} onInput={onInputEven} onBlur={onBluerEven} type='digit' disabled={disable} alwaysEmbed={true} cursorSpacing={150} />
+        <Input value={String(value.count)} onInput={onInputEven} onBlur={onBluerEven} disabled={disabled} alwaysEmbed={true} cursorSpacing={150} />
         <View className={styles.unit}>{unit}</View>
       </View>
       <View className={styles.plus} onClick={() => onPlus()}>
@@ -107,4 +117,4 @@ export default ({ minNum = 0, maxNum = 10000, step = 1, digits = 0, defaultNum =
       </View>
     </View>
   )
-}
+})

src/components/counter/index1.module.scss

@@ -1,37 +0,0 @@
-
-.main{
-    display: flex;
-    align-items: center;
-    justify-content: space-between;
-    width: 100%;
-    .reduce, .plus{
-        font-size: $font_size_big;
-        color: $color_main;
-        width: 46px;
-        height: 46px;
-        display: flex;
-        align-items: center;
-        justify-content:center;
-        font-size: 50px;
-        background-color: $color_main;
-        color: #fff;
-        border-radius: 8px;
-    }
-    .input{
-        display: flex;
-        align-items: flex-end;
-        background-color: #fff;
-        padding: 5px 10px;
-        box-sizing: border-box;
-        width: 106px;
-        border-radius: 10px;
-    }
-    input{
-        font-size: $font_size_medium;
-    }
-    .unit{
-        font-size: $font_size_min;
-        color: $color_font_two;
-    }   
-    
-}

src/components/counter/index1.tsx

@@ -1,107 +0,0 @@
-import { Input, View } from '@tarojs/components'
-import { useEffect, useMemo, useRef, useState } from 'react'
-import Big from 'big.js'
-import styles from './index.module.scss'
-type params = {
-  minNum?: number //最小值
-  maxNum?: number //最大值
-  step?: number //步长
-  defaultNum?: number //默认值
-  digits?: number //多少位小数
-  onChange?: (val: number) => void
-  onBlue?: (val: number) => void //失去焦点触发
-  onClickBtn?: (val: number) => void
-  unit?: string
-}
-export default ({ minNum = 0, maxNum = 100, step = 1, digits = 0, defaultNum = 0, onChange, onBlue, onClickBtn, unit = '' }: params) => {
-  const [value, setValue] = useState<any>({ count: defaultNum })
-
-  const onPlus = () => {
-    let { count } = value
-    let num_res = Big(count).add(step).toNumber()
-    num_res = num_res >= maxNum ? maxNum : num_res
-    num_res = formatDigits(num_res)
-    setValue({ ...value, count: num_res })
-    onChange?.(parseFloat(num_res))
-    onClickBtn?.(parseFloat(num_res))
-  }
-  const minus = () => {
-    let { count } = value
-    let num_res = Big(count).minus(step).toNumber()
-    num_res = num_res < minNum ? 0 : num_res
-    setValue({ ...value, count: num_res })
-    onChange?.(parseFloat(num_res))
-    onClickBtn?.(parseFloat(num_res))
-  }
-
-  //保留小数
-  const formatDigits = (num) => {
-    num = num + ''
-    if (num.includes('.') && digits > 0) {
-      console.log('num::', num.includes('.'))
-      let res = num.split('.')
-      let last_num = res[1].substr(0, digits)
-      return res[0] + '.' + last_num
-    }
-    return parseFloat(num)
-  }
-
-  //检查数据
-  const checkData = (val) => {
-    let num = parseFloat(val)
-    if (num > maxNum) return maxNum
-    if (num < minNum) return minNum
-    return val
-  }
-
-  const onInputEven = (e) => {
-    let res = e.detail.value
-    if (res === '') {
-      setValue({ ...value, count: minNum })
-      onChange?.(minNum)
-    } else if (!isNaN(Number(res))) {
-      let count = formatDigits(res)
-      count = checkData(count)
-      setValue({ ...value, count })
-      onChange?.(parseFloat(count as string))
-    } else {
-      let num = parseFloat(res)
-      if (!isNaN(num)) {
-        let count = formatDigits(num)
-        count = checkData(count)
-        setValue({ ...value, count })
-        onChange?.(count as number)
-      } else {
-        setValue({ ...value, count: defaultNum })
-        onChange?.(defaultNum)
-      }
-    }
-  }
-
-  const onBluerEven = () => {
-    let num = parseFloat(value.count)
-    if (!isNaN(num)) {
-      let count = formatDigits(num)
-      count = checkData(count)
-      setValue({ ...value, count })
-      onBlue?.(count as number)
-    } else {
-      setValue({ ...value, count: defaultNum })
-      onBlue?.(defaultNum)
-    }
-  }
-  return (
-    <View className={styles.main}>
-      <View className={styles.reduce} onClick={() => minus()}>
-        -
-      </View>
-      <View className={styles.input}>
-        <Input value={String(value.count)} onInput={onInputEven} onBlur={onBluerEven} type='digit' alwaysEmbed={true} cursorSpacing={150} />
-        <View className={styles.unit}>{unit}</View>
-      </View>
-      <View className={styles.plus} onClick={() => onPlus()}>
-        +
-      </View>
-    </View>
-  )
-}