React你应该学会的开发技巧【总结】!
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2021-03-05 12:03
来源:betterprogramming.pub/8-ways-to-write-clean-react-code-610c502ccf39
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干净的代码不仅仅是工作代码。简洁的代码易于阅读,易于理解并且井井有条。在本文中,我们将研究六种编写更简洁的React代码的方法。
在阅读这些建议时,请务必记住它们的实质:相信这些实践对我们编写自己的React代码很有帮助。让我们一起学习吧!
1.仅针对一种条件渲染
如果你要为某个条件成立时渲染某些元素,请不要使用三元运算符。请改用&&运算符。
不推荐写法:
import React, { useState } from 'react'
export const ConditionalRenderingWhenTrueBad = () => {
const [showConditionalText, setShowConditionalText] = useState(false)
const handleClick = () =>
setShowConditionalText(showConditionalText => !showConditionalText)
return (
<div>
<button onClick={handleClick}>切换文本</button>
{showConditionalText ? <p>成立显示内容</p> : null}
</div>
)
}
推荐写法:
import React, { useState } from 'react'
export const ConditionalRenderingWhenTrueGood = () => {
const [showConditionalText, setShowConditionalText] = useState(false)
const handleClick = () =>
setShowConditionalText(showConditionalText => !showConditionalText)
return (
<div>
<button onClick={handleClick}>切换文本</button>
{showConditionalText && <p>成立显示内容!</p>}
</div>
)
}
2.Boolean Props简写
isHungry处简写了
不推荐写法:
import React from 'react'
const HungryMessage = ({ isHungry }) => (
<span>{isHungry ? 'I am hungry' : 'I am full'}</span>
)
export const BooleanPropBad = () => (
<div>
<HungryMessage isHungry={true} />
<HungryMessage isHungry={false} />
</div>
)
推荐写法:
import React from 'react'
const HungryMessage = ({ isHungry }) => (
<span>{isHungry ? 'I am hungry' : 'I am full'}</span>
)
export const BooleanPropGood = () => (
<div>
<HungryMessage isHungry />
<HungryMessage isHungry={false} />
</div>
)
3.String Props简写
personName处简写了
不推荐写法:
import React from 'react'
const Greeting = ({ personName }) => <p>Hi, {personName}!</p>
export const StringPropValuesBad = () => (
<div>
<Greeting personName={"John"} />
<Greeting personName={'Matt'} />
<Greeting personName={`Paul`} />
</div>
)
推荐写法:
import React from 'react'
const Greeting = ({ personName }) => <p>Hi, {personName}!</p>
export const StringPropValuesGood = () => (
<div>
<Greeting personName="John" />
<Greeting personName="Matt" />
<Greeting personName="Paul" />
</div>
)
4.事件处理函数简写
onChange处简写了
不推荐写法:
import React, { useState } from 'react'
export const UnnecessaryAnonymousFunctionsBad = () => {
const [inputValue, setInputValue] = useState('')
const handleChange = e => {
setInputValue(e.target.value)
}
return (
<>
<label htmlFor="name">Name: </label>
<input id="name" value={inputValue} onChange={e => handleChange(e)} />
</>
)
}
推荐写法:
import React, { useState } from 'react'
export const UnnecessaryAnonymousFunctionsGood = () => {
const [inputValue, setInputValue] = useState('')
const handleChange = e => {
setInputValue(e.target.value)
}
return (
<>
<label htmlFor="name">Name: </label>
<input id="name" value={inputValue} onChange={handleChange} />
</>
)
}
5.组件作为参数返回
IconComponent处简写了
不推荐写法:
import React from 'react'
const CircleIcon = () => (
<svg height="100" width="100">
<circle cx="50" cy="50" r="40" stroke="black" stroke-width="3" fill="red" />
</svg>
)
const ComponentThatAcceptsAnIcon = ({ IconComponent }) => (
<div>
<IconComponent />
</div>
)
export const UnnecessaryAnonymousFunctionComponentsBad = () => (
<ComponentThatAcceptsAnIcon IconComponent={() => <CircleIcon />} />
)
推荐写法:
import React from 'react'
const CircleIcon = () => (
<svg height="100" width="100">
<circle cx="50" cy="50" r="40" stroke="black" stroke-width="3" fill="red" />
</svg>
)
const ComponentThatAcceptsAnIcon = ({ IconComponent }) => (
<div>
<IconComponent />
</div>
)
export const UnnecessaryAnonymousFunctionComponentsGood = () => (
<ComponentThatAcceptsAnIcon IconComponent={CircleIcon} />
)
6.设置依赖于先前pros的pros
如果新状态依赖于先前状态,则始终将状态设置为先前状态的函数。可以批处理React状态更新,并且不以这种方式编写更新会导致意外结果,
setIsDisabled
处简写
不推荐写法:
import React, { useState } from 'react'
export const PreviousStateBad = () => {
const [isDisabled, setIsDisabled] = useState(false)
const toggleButton = () => setIsDisabled(!isDisabled)
const toggleButton2Times = () => {
for (let i = 0; i < 2; i++) {
toggleButton()
}
}
return (
<div>
<button disabled={isDisabled}>
I'm {isDisabled ? 'disabled' : 'enabled'}
</button>
<button onClick={toggleButton}>切换按钮状态</button>
<button onClick={toggleButton2Times}>切换按钮状态2次</button>
</div>
)
}
推荐写法:
import React, { useState } from 'react'
export const PreviousStateGood = () => {
const [isDisabled, setIsDisabled] = useState(false)
const toggleButton = () => setIsDisabled(isDisabled => !isDisabled)
const toggleButton2Times = () => {
for (let i = 0; i < 2; i++) {
toggleButton()
}
}
return (
<div>
<button disabled={isDisabled}>
I'm {isDisabled ? 'disabled' : 'enabled'}
</button>
<button onClick={toggleButton}>切换按钮状态</button>
<button onClick={toggleButton2Times}>切换按钮状态2次</button>
</div>
)
}
接下来你该做的
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