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freeCodeCamp/guide/chinese/certifications/front-end-libraries/react/override-default-props/index.md
Randell Dawson 0a1eeea424 fix(guide) Replace invalid prism code block names (#35961)
* fix: replace sh with shell

fix replace terminal with shell

fix replace node with js

fix replace output with shell

fix replace cs with csharp

fix replace c++ with cpp

fix replace c# with csharp

fix replace javasctipt with js

fix replace syntax  with js

fix replace unix with shell

fix replace linux with shell

fix replace java 8 with java

fix replace swift4 with swift

fix replace react.js with jsx

fix replace javascriot with js

fix replace javacsript with js

fix replace c++ -  with cpp

fix: corrected various typos

fix: replace Algorithm with nothing

fix: replace xaml with xml

fix: replace solidity with nothing

fix: replace c++ with cpp

fix: replace txt with shell

fix: replace code with json and css

fix: replace console with shell
2019-05-15 19:08:19 +02:00

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title, localeTitle
title localeTitle
Override Default Props 覆盖默认道具

覆盖默认道具

此挑战使您可以覆盖Items组件的props quantity的默认值。其中, quantity默认值设置为0

const Items = (props) => { 
  return <h1>Current Quantity of Items in Cart: {props.quantity}</h1> 
 } 
 
 Items.defaultProps = { 
  quantity: 0 
 } 

要覆盖默认的props值要遵循的语法是

<Component propsName={Value}/> 

在语法之后,应在给定代码下面声明以下代码

<Items quantity={50}/> 

这将覆盖值050