{"id":123092,"date":"2026-11-06T11:32:55","date_gmt":"2026-11-06T03:32:55","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/123092.html"},"modified":"2026-11-06T11:32:55","modified_gmt":"2026-11-06T03:32:55","slug":"%e7%88%b6%e7%bb%84%e4%bb%b6setstate%ef%bc%8c%e5%ad%90%e7%bb%84%e4%bb%b6%e4%b8%ba%e4%bd%95%e4%bb%8d%e9%87%8d%e6%b8%b2%e6%9f%93%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/123092.html","title":{"rendered":"\u7236\u7ec4\u4ef6setState\uff0c\u5b50\u7ec4\u4ef6\u4e3a\u4f55\u4ecd\u91cd\u6e32\u67d3\uff1f"},"content":{"rendered":"

\/* MD \/ \u5bcc\u6587\u672c\u4e2d\u7684 .toc\uff08\u542b\u535a\u5ba2\u56ed\u642c\u5bb6\u7b49\u5d4c\u5957\u7ed3\u6784\uff09\uff1b.toc-box \u5728\u4fa7\u680f\uff0c\u4e0d\u53d7\u5f71\u54cd *\/
\n #content_views .toc,
\n \/* \u7f16\u8f91\u5668\u5e38\u5728\u76ee\u5f55\u524d\u540e\u63d2\u5165\u7a7a p\uff08:empty \u4ecd\u5360 20px\uff09\uff0c\u4e00\u5e76\u53bb\u6389\u907f\u514d\u9876\u7a7a\u9699 *\/
\n #content_views.markdown_views > p:empty:has(+ .toc),
\n #content_views.markdown_views > .toc + p:empty,
\n \/* \u5bcc\u6587\u672c\u65e7\u7248\u76ee\u5f55\u6807\u8bb0 *\/
\n #content_views.htmledit_views #main-toc,
\n #content_views.htmledit_views #hr-toc,
\n #content_views.htmledit_views p[id*=\\”-toc\\”] {
\n display: none !important;
\n }
\n \/* \u76ee\u5f55\u53bb\u6389\u540e\uff0c\u7d27\u8ddf\u7684\u9996\u4e2a\u6807\u9898\u4e0d\u518d\u591a\u51fa\u4e00\u5757\u4e0a\u8fb9\u8ddd *\/
\n #content_views.markdown_views > .toc + h1,
\n #content_views.markdown_views > .toc + h2,
\n #content_views.markdown_views > .toc + h3,
\n #content_views.markdown_views > .toc + h4,
\n #content_views.markdown_views > .toc + p:empty + h1,
\n #content_views.markdown_views > .toc + p:empty + h2,
\n #content_views.markdown_views > .toc + p:empty + h3,
\n #content_views.markdown_views > .toc + p:empty + h4 {
\n margin-top: 0 !important;
\n }<\/p>\n

import React,{Component} from 'react';
\nimport '.\/index.css';<\/p>\n

export default class Demo extends Component{
\n state = {
\n count: 100,
\n }
\n render(){
\n console.log('\u7236\u7ec4\u4ef6\u6e32\u67d3');<\/p>\n

return (
\n <div className="father">
\n <h1>\u6211\u662f\u7236\u7ec4\u4ef6<\/h1>
\n <p className="count">\u5f53\u524d\u8ba1\u6570: {this.state.count}<\/p>
\n <button onClick={() => this.setState({count: this.state.count + 1})}>\u589e\u52a0<\/button>
\n <Child count={this.state.count} \/>
\n <\/div>
\n )
\n }
\n}<\/p>\n

class Child extends Component{
\n render(){
\n console.log('\u5b50\u7ec4\u4ef6\u6e32\u67d3');<\/p>\n

return (
\n <div className="child">
\n <h1>\u6211\u662f\u5b50\u7ec4\u4ef6<\/h1>
\n <p className="count">\u5f53\u524d\u8ba1\u6570: {this.props.count}<\/p>
\n <\/div>
\n )
\n }
\n}<\/p>\n

\u4ee5\u4e0a\u4ee3\u7801\u5f53\u521d\u6b21\u6e32\u67d3\u65f6，\u540e\u53f0\u6253\u5370<\/p>\n

\"\"<\/p>\n

\u5f53\u6e32\u67d3\u5230\u7236\u7ec4\u4ef6\u65f6，\u6267\u884crender，\u6253\u5370；\u6267\u884c\u5230<Child count={this.state.count} \/>\u00a0<\/span>\u65f6，\u518d\u53bb\u6267\u884c\u5b50\u7ec4\u4ef6\u4e2d\u7684render，\u6253\u5370\u3002\u8fd9\u662f\u5b8c\u5168\u6b63\u5e38\u7684\u6d41\u7a0b\u3002<\/p>\n

\u5f53\u7236\u7ec4\u4ef6\u6267\u884c<button onClick={() => this.setState({count: this.state.count + 1})}>\u589e\u52a0<\/button>\u00a0\u65f6<\/span>，\u7236\u7ec4\u4ef6\u7684\u72b6\u6001\u53d1\u751f\u6539\u53d8，\u89e6\u53d1render，\u6253\u5370，\u8fdb\u800c\u5b50\u7ec4\u4ef6\u4e5f\u4f1a\u89e6\u53d1render<\/p>\n

\"\"<\/p>\n

\u90a3\u5f53\u6211\u4e0d\u5411\u5b50\u7ec4\u4ef6\u4f20\u9012\u4efb\u4f55\u503c，\u5f53\u6211\u6267\u884c\u7236\u7ec4\u4ef6\u4e2d\u7684\u6539\u53d8count\u7684\u65b9\u6cd5\u65f6，\u4e24\u4e2a\u7ec4\u4ef6\u4f1a\u90fd\u6253\u5370\u5417？<\/p>\n

import React,{Component} from 'react';
\nimport '.\/index.css';<\/p>\n

export default class Demo extends Component{
\n state = {
\n count: 100,
\n }
\n render(){
\n console.log('\u7236\u7ec4\u4ef6\u6e32\u67d3');<\/p>\n

return (
\n <div className="father">
\n <h1>\u6211\u662f\u7236\u7ec4\u4ef6<\/h1>
\n <p className="count">\u5f53\u524d\u8ba1\u6570: {this.state.count}<\/p>
\n <button onClick={() => this.setState({count: this.state.count + 1})}>\u589e\u52a0<\/button>
\n <Child \/>
\n <\/div>
\n )
\n }
\n}<\/p>\n

class Child extends Component{
\n render(){
\n console.log('\u5b50\u7ec4\u4ef6\u6e32\u67d3');<\/p>\n

return (
\n <div className="child">
\n <h1>\u6211\u662f\u5b50\u7ec4\u4ef6<\/h1>
\n {\/* <p className="count">\u5f53\u524d\u8ba1\u6570: {this.props.count}<\/p> *\/}
\n <\/div>
\n )
\n }
\n}<\/p>\n

\u7ed3\u679c\u5c31\u662f，\u5b50\u7ec4\u4ef6\u7167\u6837\u4f1a\u6267\u884crender，\u91cd\u65b0\u8fdb\u884c\u6e32\u67d3\u3002\u800c\u4e14\u5f53\u7236\u7ec4\u4ef6\u6267\u884c\u00a0this.setState({})<\/span>\u00a0\u7167\u6837\u4f1a\u51fa\u73b0\u76f8\u540c\u7684\u6548\u679c<\/p>\n

\u5b50\u7ec4\u4ef6\u6211\u53ea\u662f\u60f3\u5c55\u793a\u4e00\u4e0b，\u53ea\u662f\u7236\u7ec4\u4ef6\u7684\u72b6\u6001\u6539\u53d8\u4e86，\u4ed6\u6267\u884crender\u5b8c\u5168\u6ca1\u6709\u95ee\u9898，\u4f46\u662f\u5b50\u7ec4\u4ef6\u518d\u91cd\u65b0\u6e32\u67d3\u5c31\u6709\u70b9\u8017\u6027\u80fd\u4e86\u3002<\/p>\n

Component\u76842\u4e2a\u95ee\u9898<\/h3>\n

1\u3001\u53ea\u8981\u6267\u884csetState(),\u5373\u4f7f\u4e0d\u6539\u53d8\u72b6\u6001\u6570\u636e，\u7ec4\u4ef6\u4e5f\u4f1a\u91cd\u65b0render(),\u6548\u7387\u4f4e<\/p>\n

2\u3001\u53ea\u5f53\u524d\u7ec4\u4ef6\u91cd\u65b0render(),\u5c31\u4f1a\u91cd\u65b0render\u5b50\u7ec4\u4ef6，\u7eb5\u4f7f\u5b50\u7ec4\u4ef6\u6ca1\u6709\u7528\u5230\u7236\u7ec4\u4ef6\u7684\u4efb\u4f55\u6570\u636e<\/p>\n

\u6548\u7387\u9ad8\u7684\u505a\u6cd5<\/h3>\n

\u53ea\u6709\u5f53\u524d\u7ec4\u4ef6\u7684state\u6216props\u6570\u636e\u53d1\u751f\u6539\u53d8\u65f6\u624d\u91cd\u65b0render()<\/p>\n

\u539f\u56e0<\/h3>\n

Component\u4e2d\u7684shouldComponentUpdate()\u603b\u662f\u8fd4\u56detrue<\/p>\n

\u89e3\u51b3\u65b9\u6cd5\u4e00<\/h3>\n

\u91cd\u5199shouldComponentUpdate\u65b9\u6cd5，\u6bd4\u8f83\u65b0\u65e7state\u6216props\u6570\u636e，\u5982\u679c\u6709\u53d8\u5316\u53c2\u8fd4\u56detrue，\u5982\u679c\u6ca1\u6709\u5219\u8fd4\u56defalse<\/p>\n

import React,{Component} from 'react';
\nimport '.\/index.css';<\/p>\n

export default class Demo extends Component{
\n state = {
\n count: 100,
\n }<\/p>\n

shouldComponentUpdate(nextProps, nextState){
\n \/\/nextProps: \u4e0b\u4e00\u4e2a props
\n \/\/nextState: \u4e0b\u4e00\u4e2a state
\n \/\/\u8fd4\u56de\u503c: true \u8868\u793a\u7ec4\u4ef6\u9700\u8981\u91cd\u65b0\u6e32\u67d3，false \u8868\u793a\u4e0d\u9700\u8981\u91cd\u65b0\u6e32\u67d3
\n console.log(nextProps, nextState);
\n \/\/\u5982\u679c\u4e0b\u4e00\u4e2a props \u6216\u4e0b\u4e00\u4e2a state \u4e0e\u5f53\u524d props \u6216\u5f53\u524d state \u76f8\u540c，\u8fd4\u56de false
\n \/\/\u5982\u679c\u4e0b\u4e00\u4e2a props \u6216\u4e0b\u4e00\u4e2a state \u4e0e\u5f53\u524d props \u6216\u5f53\u524d state \u4e0d\u540c，\u8fd4\u56de true
\n if(nextState.count !== this.state.count){
\n return true;
\n }
\n return false;
\n \/\/ return nextState.count !== this.state.count;
\n }<\/p>\n

render(){
\n console.log('\u7236\u7ec4\u4ef6\u6e32\u67d3');<\/p>\n

return (
\n <div className="father">
\n <h1>\u6211\u662f\u7236\u7ec4\u4ef6<\/h1>
\n <p className="count">\u5f53\u524d\u8ba1\u6570: {this.state.count}<\/p>
\n <button onClick={() => this.setState({ count: this.state.count + 100 })}>\u589e\u52a0<\/button>
\n {\/* <Child \/> *\/}
\n <\/div>
\n )
\n }
\n}<\/p>\n

\/\/ class Child extends Component{
\n\/\/ render(){
\n\/\/ console.log('\u5b50\u7ec4\u4ef6\u6e32\u67d3');<\/p>\n

\/\/ return (
\n\/\/ <div className="child">
\n\/\/ <h1>\u6211\u662f\u5b50\u7ec4\u4ef6<\/h1>
\n\/\/ {\/* <p className="count">\u5f53\u524d\u8ba1\u6570: {this.props.count}<\/p> *\/}
\n\/\/ <\/div>
\n\/\/ )
\n\/\/ }
\n\/\/ }<\/p>\n

\u5f53\u7236\u7ec4\u4ef6\u6267\u884c\u65b9\u6cd5，\u6539\u53d8\u72b6\u6001\u503c，\u4e5f\u89e6\u53d1render，\u5b8c\u5168\u6b63\u786e\u3002<\/p>\n

\"\"<\/p>\n

\u5f53\u6267\u884c this.setState({})\u5462？<\/p>\n

<button onClick={() => this.setState({})}>\u589e\u52a0<\/button><\/p>\n

\"\"<\/p>\n

\u7236\u7ec4\u4ef6\u7684\u72b6\u6001\u5728\u524d\u540e\u90fd\u6ca1\u6709\u53d1\u751f\u53d8\u5316，\u81ea\u7136\u4e0d\u4f1a\u91cd\u65b0render，\u8fbe\u5230\u4e86\u63d0\u5347\u6548\u7387\u7684\u76ee\u7684\u3002<\/p>\n

\u540c\u7406\u5b50\u7ec4\u4ef6\u4e5f\u53ef\u4ee5\u8fd9\u6837\u505a<\/p>\n

import React,{Component} from 'react';
\nimport '.\/index.css';<\/p>\n

export default class Demo extends Component{
\n state = {
\n count: 100,
\n }<\/p>\n

shouldComponentUpdate(nextProps, nextState){
\n \/\/nextProps: \u4e0b\u4e00\u4e2a props
\n \/\/nextState: \u4e0b\u4e00\u4e2a state
\n \/\/\u8fd4\u56de\u503c: true \u8868\u793a\u7ec4\u4ef6\u9700\u8981\u91cd\u65b0\u6e32\u67d3，false \u8868\u793a\u4e0d\u9700\u8981\u91cd\u65b0\u6e32\u67d3
\n console.log(nextProps, nextState);
\n \/\/\u5982\u679c\u4e0b\u4e00\u4e2a props \u6216\u4e0b\u4e00\u4e2a state \u4e0e\u5f53\u524d props \u6216\u5f53\u524d state \u76f8\u540c，\u8fd4\u56de false
\n \/\/\u5982\u679c\u4e0b\u4e00\u4e2a props \u6216\u4e0b\u4e00\u4e2a state \u4e0e\u5f53\u524d props \u6216\u5f53\u524d state \u4e0d\u540c，\u8fd4\u56de true
\n if(nextState.count !== this.state.count){
\n return true;
\n }
\n return false;
\n \/\/ return nextState.count !== this.state.count;
\n }<\/p>\n

render(){
\n console.log('\u7236\u7ec4\u4ef6\u6e32\u67d3');<\/p>\n

return (
\n <div className="father">
\n <h1>\u6211\u662f\u7236\u7ec4\u4ef6<\/h1>
\n <p className="count">\u5f53\u524d\u8ba1\u6570: {this.state.count}<\/p>
\n <button onClick={() => this.setState({ count: this.state.count + 100 })}>\u589e\u52a0<\/button>
\n <Child count={this.state.count} \/>
\n <\/div>
\n )
\n }
\n}<\/p>\n

class Child extends Component{
\n shouldComponentUpdate(nextProps, nextState){
\n \/\/nextProps: \u4e0b\u4e00\u4e2a props
\n \/\/nextState: \u4e0b\u4e00\u4e2a state
\n \/\/\u8fd4\u56de\u503c: true \u8868\u793a\u7ec4\u4ef6\u9700\u8981\u91cd\u65b0\u6e32\u67d3，false \u8868\u793a\u4e0d\u9700\u8981\u91cd\u65b0\u6e32\u67d3
\n if(nextProps.count !== this.props.count){
\n return true;
\n }
\n return false;
\n \/\/ return nextState.count !== this.state.count;
\n }
\n render(){
\n console.log('\u5b50\u7ec4\u4ef6\u6e32\u67d3');<\/p>\n

return (
\n <div className="child">
\n <h1>\u6211\u662f\u5b50\u7ec4\u4ef6<\/h1>
\n <p className="count">\u5f53\u524d\u8ba1\u6570: {this.props.count}<\/p>
\n <\/div>
\n )
\n }
\n}<\/p>\n

\u6ce8\u610f\u7684\u662f，\u5f53\u7236\u7ec4\u4ef6\u6267\u884c\u00a0this.setState({})\u00a0\u6216\u8005\u4e0d\u7ed9\u5b50\u7ec4\u4ef6\u4f20\u9012\u503c\u00a0<Child \/>，\u5b50\u7ec4\u4ef6\u90fd\u4e0d\u4f1a\u66f4\u65b0\u503c\u7684\u3002<\/p>\n

\u7279\u522b\u6ce8\u610f<\/h4>\n

import React,{Component} from 'react';
\nimport '.\/index.css';<\/p>\n

export default class Demo extends Component{
\n state = {
\n count: 100,
\n stu:['\u5f20\u4e09','\u674e\u56db','\u738b\u4e94']
\n }<\/p>\n

shouldComponentUpdate(nextProps, nextState){
\n \/\/nextProps: \u4e0b\u4e00\u4e2a props
\n \/\/nextState: \u4e0b\u4e00\u4e2a state
\n \/\/\u8fd4\u56de\u503c: true \u8868\u793a\u7ec4\u4ef6\u9700\u8981\u91cd\u65b0\u6e32\u67d3，false \u8868\u793a\u4e0d\u9700\u8981\u91cd\u65b0\u6e32\u67d3
\n console.log(nextProps, nextState);
\n \/\/\u5982\u679c\u4e0b\u4e00\u4e2a props \u6216\u4e0b\u4e00\u4e2a state \u4e0e\u5f53\u524d props \u6216\u5f53\u524d state \u76f8\u540c，\u8fd4\u56de false
\n \/\/\u5982\u679c\u4e0b\u4e00\u4e2a props \u6216\u4e0b\u4e00\u4e2a state \u4e0e\u5f53\u524d props \u6216\u5f53\u524d state \u4e0d\u540c，\u8fd4\u56de true
\n if(nextState.count !== this.state.count){
\n return true;
\n }
\n if(nextState.stu !== this.state.stu){
\n return true;
\n }
\n return false;
\n \/\/ return nextState.count !== this.state.count;
\n }
\n addStu(){
\n const {stu} = this.state;
\n stu.push('\u8d75\u516d');
\n this.setState({
\n stu
\n })
\n }<\/p>\n

render(){
\n console.log('\u7236\u7ec4\u4ef6\u6e32\u67d3');<\/p>\n

return (
\n <div className="father">
\n <h1>\u6211\u662f\u7236\u7ec4\u4ef6<\/h1>
\n <p className="count">\u5f53\u524d\u8ba1\u6570: {this.state.count}<\/p>
\n <p className="stu">\u5f53\u524d\u5b66\u751f: {this.state.stu.join('\u3001')}<\/p>
\n <button onClick={() => this.setState({ count: this.state.count + 100 })}>\u589e\u52a0<\/button>
\n <button onClick={() => this.addStu()}>\u589e\u52a0\u5b66\u751f<\/button>
\n <\/div>
\n )
\n }
\n}<\/p>\n

addStu(){
\n const {stu} = this.state;
\n stu.push('\u8d75\u516d');
\n this.setState({
\n stu
\n })
\n }<\/p>\n

if(nextState.stu !== this.state.stu){
\n return true;
\n }<\/p>\n

\u662f\u89e6\u53d1\u4e0d\u4e86\u66f4\u65b0\u7684，\u56e0\u4e3a\u7ed3\u6784\u51fa\u6765\u7684stu\u867d\u7136\u503c\u53d8\u4e86，\u4f46\u662fshouldComponentUpdate\u5224\u65ad\u4e2dnextState.stu\u548cthis.state.stu\u7684\u5730\u5740\u503c\u662f\u524d\u540e\u76f8\u540c\u7684，\u8fdb\u800c\u4e0d\u4f1a\u89e6\u53d1render，\u5373\u4fbfnextState\u5728\u53d8\u5316，<\/p>\n

\u8981\u60f3\u89e3\u51b3\u8fd9\u4e2a\u9ebb\u70e6\u53ef\u4ee5\u8fd9\u6837\u89e3\u51b3<\/p>\n

addStu(){
\n this.setState({
\n stu: […this.state.stu, '\u8d75\u516d']
\n })
\n }<\/p>\n

\u7c7b\u4f3cpush\u548cshift\u7684\u64cd\u4f5c\u9700\u8981\u4e0b！！！<\/p>\n

\u5355\u72ec\u5199<\/p>\n

if(nextState.stu.join(',') !== this.state.stu.join(',')){
\n return true;
\n }<\/p>\n

\u4e5f\u662f\u89e3\u51b3\u4e0d\u4e86\u7684<\/p>\n

\u89e3\u51b3\u65b9\u6cd5\u4e8c<\/h3>\n

\u4f7f\u7528 PureComponent\u4ee3\u66ffComponent\u6765\u8ba9\u7ec4\u4ef6\u7ee7\u627f，\u5b83\u91cd\u5199\u4e86shouldComponentUpdate(),\u53ea\u6709state\u548cprops\u6570\u636e\u6709\u53d8\u5316\u624d\u8fd4\u56detrue<\/p>\n

\u6ce8\u610f<\/h4>\n

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