react中怎么禁止button渲染

//  啟用狀態     const flags = true;     <Button disabled={flags}/>

//  禁用狀態     <Button disabled/> //  禁用狀態2 變量控制     const flags = false;     <Button disabled={flags}/>

import React, { Component } from 'react' import "./dist/index.css"; import PropTypes from "prop-types"; import classnames from "classnames"; class Button extends Component {     constructor(props) {         super(props);         this.state = { }     }     handleClick = () => {         if (!this.props.onClick) return;         this.props.onClick();     };     render() {          //為了能讓 Button 組件有多個樣式選擇，于是安裝 classnames 插件來幫助切換類名來切換樣式：         const ClassName = classnames({  //根據父組件傳進來的 size 來判斷使用什么類名             "btn": true,             [`btn_${this.props.type}`]: true,             [`btn_${this.props.size}`]: true,             "btn_disabled": this.props.disabled,             "btn_circle": this.props.circle,         });         return (             <button                 className = {ClassName}                 onClick = {this.handleClick}             >                 {this.props.children}             </button>          );     } } //   組件的默認屬性 Button.defaultProps = {     children: "Button",     type: "primary",     size: "default",     disabled: false,     circle: false, }; //   使用propTypes  進行組件屬性的檢查 Button.propTypes = {     children: PropTypes.string,     type: PropTypes.oneOf(["primary", "success", "warning", "danger", "info"]),     size: PropTypes.oneOf(["default", "small", "large"]),     disabled: PropTypes.bool,     circle: PropTypes.bool, };   export default Button;

@bG-0: #fff; @bF-1: #c0c4cc; @PRIMARY: #409eff; @SUCCESS: #67c23a; @DANGER: #f65c6c; @WARNING: #e6a23c; @INFO: #909399; @FONTSIZE: 14px; @radius: 4px; @btnBorderRadius: 4px; @btnBorder: 1px solid transparent; @btnMargin: 0 8px 12px 0; @btnFontSize: 14px; @btnLargeFontSize: 16px; @btnSmallFontSize: 12px; @btnPadding: 4px 15px; @btnLargePadding: 6.4px 15px; @btnSmallPadding: 1px 7px; @btnDisabledCol: #909399; .btn {     width: 60px;     height: 30px;     border-radius: @btnBorderRadius;     border: @btnBorder;     outline: none;     appearance: none;     text-align: center;     margin: @btnMargin;     cursor: pointer;     justify-content: center;     align-items: center;     text-align: center;     &_primary {         background-color: @PRIMARY;         color: @bG-0;         &:hover {             opacity: 0.8;         }     }     &_success {         background: @SUCCESS;         color: @bG-0;         &:hover {             opacity: 0.8;         }     }     &_danger {         background: @DANGER;         color: @bG-0;         &:hover {             opacity: 0.8;         }     }     &_warning {         background: @WARNING;         color: @bG-0;         &:hover {             opacity: 0.8;         }     }     &_info {         background-color: @bG-0;         color: black;         border: 1px dashed #999;         &:hover {             opacity: 0.8;         }     }     &_disabled {         background-color: @bF-1;         color: @btnDisabledCol;         cursor: not-allowed;         &:hover {             opacity: 1;         }     }     &_circle {         padding: 0;         font-size: 16px;         text-align: center;         width: 30px;         height: 30px;         overflow: hidden;         border-radius: 50%;         word-break: break-all;     }     &_large {         font-size: @btnLargeFontSize;     }     &_default {         font-size: @btnFontSize;     }     &_small {         font-size: @btnSmallFontSize;     } }

import './App.css'; import Button from './component/Button/index' function App() {   const handleClick = () => {     alert('我是組件');   }   return (     <div className="App">       <header className="App-header">         <Button>查詢</Button>         <Button type = "success">成功</Button>         <Button type = "warning">警告</Button>         <Button type = "danger">失敗</Button>         <Button type = "info">灰色</Button>         <Button onClick={ handleClick }>事件</Button>         <Button size='default'>small</Button>         <Button size='small'>small</Button>         <Button size='large'>small</Button>         <Button disabled={true} >a</Button>         <Button size='default' circle={true} >a</Button>         <Button size='small' circle={true} >a</Button>         <Button size='large' circle={true} >a</Button>       </header>     </div>   ); } export default App;