{"id":38314,"date":"2023-01-24T19:37:06","date_gmt":"2022-08-27T22:24:42","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8ereact%e7%b1%bb%e7%bb%84%e4%bb%b6%e7%9a%84%e9%9d%99%e6%80%81%e5%b1%9e%e6%80%a7\/"},"modified":"2024-01-15T09:53:15","modified_gmt":"2024-01-15T01:53:15","slug":"%e5%85%b3%e4%ba%8ereact%e7%b1%bb%e7%bb%84%e4%bb%b6%e7%9a%84%e9%9d%99%e6%80%81%e5%b1%9e%e6%80%a7","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8ereact%e7%b1%bb%e7%bb%84%e4%bb%b6%e7%9a%84%e9%9d%99%e6%80%81%e5%b1%9e%e6%80%a7\/","title":{"rendered":"\u5173\u4e8eReact\u7c7b\u7ec4\u4ef6\u7684\u9759\u6001\u5c5e\u6027"},"content":{"rendered":"

\u53ef\u4ee5\u5728React\u4e2d\u4f7f\u7528\u57fa\u4e8e\u7c7b\u7684\u7ec4\u4ef6\u6765\u521b\u5efa\u7ec4\u4ef6\u3002<\/p>\n

\u5728\u7c7b\u7ec4\u4ef6\u4e2d\uff0c\u5b58\u5728\u7279\u5b9a\u7684\u9759\u6001\u65b9\u6cd5\u548c\u5c5e\u6027\u3002\u5728\u672c\u6b21\u89e3\u91ca\u4e2d\uff0c\u6211\u4eec\u5c06\u7b80\u5355\u5730\u89e3\u91ca\u8fd9\u4e9b\u9759\u6001\u65b9\u6cd5\u548c\u5c5e\u6027\u3002<\/p>\n

\u9759\u6001\uff08static\uff09\u662f\u4ec0\u4e48\uff1f<\/h2>\n

\u9996\u5148\uff0c\u6211\u8981\u89e3\u91ca\u4e00\u4e0bstatic\u7684\u6982\u5ff5\u3002static\u662fJavaScript\u7684\u4e00\u4e2a\u5173\u952e\u5b57\uff0c\u7528\u4e8e\u5b9a\u4e49\u4e0e\u7c7b\u76f8\u5173\u7684\u9759\u6001\u65b9\u6cd5\u6216\u5c5e\u6027\u3002\u8fd9\u4e9b\u9759\u6001\u65b9\u6cd5\u548c\u5c5e\u6027\u53ef\u4ee5\u5728\u4e0d\u5b9e\u4f8b\u5316\u7c7b\u7684\u60c5\u51b5\u4e0b\uff0c\u76f4\u63a5\u4ece\u7c7b\u672c\u8eab\u8fdb\u884c\u8bbf\u95ee\u3002<\/p>\n

\u5728React\u7c7b\u7ec4\u4ef6\u4e2d\u7684static<\/h2>\n

\u5728React\u7684\u7c7b\u7ec4\u4ef6\u4e2d\uff0cstatic\u5173\u952e\u5b57\u7528\u4e8e\u6307\u5b9a\u4e00\u4e9b\u65b9\u6cd5\u548c\u5c5e\u6027\u6765\u5b9e\u73b0\u7279\u5b9a\u7684\u529f\u80fd\u3002\u4ee5\u4e0b\u662f\u5bf9\u5176\u8fdb\u884c\u8bf4\u660e\uff1a<\/p>\n

\u9759\u6001\u9ed8\u8ba4\u5c5e\u6027<\/h3>\n

\u9ed8\u8ba4\u5c5e\u6027\uff08defaultProps\uff09\u662f\u7528\u4e8e\u5b9a\u4e49\u7ec4\u4ef6\u9ed8\u8ba4props\u7684\u9759\u6001\u5c5e\u6027\u3002\u5f53\u6ca1\u6709\u4ece\u7236\u7ec4\u4ef6\u4f20\u9012props\u65f6\uff0c\u5b83\u5c06\u88ab\u4f7f\u7528\u3002<\/p>\n

class<\/span> MyComponent<\/span> extends<\/span> React<\/span>.<\/span>Component<\/span> {<\/span>\r\n  static<\/span> defaultProps<\/span> =<\/span> {<\/span>\r\n    name<\/span>:<\/span> '<\/span>Default Name<\/span>'<\/span>\r\n  };<\/span>\r\n  \/\/...<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u9759\u6001\u5c5e\u6027\u7c7b\u578b<\/h3>\n
propTypes\u662f\u4e00\u4e2a\u7528\u4e8e\u6307\u5b9a\u7ec4\u4ef6\u63a5\u6536props\u7c7b\u578b\u7684\u9759\u6001\u5c5e\u6027\u3002\u5728\u5f00\u53d1\u8fc7\u7a0b\u4e2d\uff0c\u5b83\u7528\u4e8e\u8fdb\u884c\u7c7b\u578b\u68c0\u67e5\uff0c\u5e76\u5728\u4f20\u9012\u4e86\u610f\u5916\u7c7b\u578b\u7684props\u65f6\u53d1\u51fa\u8b66\u544a\u3002<\/p>\n
import<\/span> PropTypes<\/span> from<\/span> '<\/span>prop-types<\/span>'<\/span>;<\/span>\r\n\r\nclass<\/span> MyComponent<\/span> extends<\/span> React<\/span>.<\/span>Component<\/span> {<\/span>\r\n  static<\/span> propTypes<\/span> =<\/span> {<\/span>\r\n    name<\/span>:<\/span> PropTypes<\/span>.<\/span>string<\/span>\r\n  };<\/span>\r\n  \/\/...<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u9759\u6001\u4e0a\u4e0b\u6587\u7c7b\u578b<\/h3>\n
contextType\u662f\u4e00\u4e2a\u7528\u4e8e\u5728\u7c7b\u7ec4\u4ef6\u4e2d\u4f7f\u7528\u4e0a\u4e0b\u6587\u7684\u9759\u6001\u5c5e\u6027\u3002\u901a\u8fc7\u8bbe\u7f6e\u8be5\u5c5e\u6027\uff0c\u60a8\u53ef\u4ee5\u901a\u8fc7this.context\u8bbf\u95ee\u5f53\u524d\u7684\u4e0a\u4e0b\u6587\u503c\u3002<\/p>\n
import<\/span> MyContext<\/span> from<\/span> '<\/span>.\/MyContext<\/span>'<\/span>;<\/span>\r\n\r\nclass<\/span> MyComponent<\/span> extends<\/span> React<\/span>.<\/span>Component<\/span> {<\/span>\r\n  static<\/span> contextType<\/span> =<\/span> MyContext<\/span>;<\/span>\r\n  \/\/...<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u7406\u89e3\u4ee5\u4e0bReact\u4e2d\u7c7b\u7ec4\u4ef6\u5e38\u7528\u7684\u9759\u6001\u7528\u9014\uff0c\u80fd\u591f\u66f4\u6df1\u5165\u5730\u53d1\u6325\u7c7b\u7ec4\u4ef6\u7684\u529f\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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