{"id":5764,"date":"2022-03-22T05:01:50","date_gmt":"2022-03-21T21:01:50","guid":{"rendered":"http:\/\/39.106.39.94\/?p=5764"},"modified":"2022-09-17T16:37:48","modified_gmt":"2022-09-17T08:37:48","slug":"portal","status":"publish","type":"post","link":"https:\/\/lilichao.com\/?p=5764","title":{"rendered":"portal"},"content":{"rendered":"\n

\u5728React\u4e2d\uff0c\u7236\u7ec4\u4ef6\u5f15\u5165\u5b50\u7ec4\u4ef6\u540e\uff0c\u5b50\u7ec4\u4ef6\u4f1a\u76f4\u63a5\u5728\u7236\u7ec4\u4ef6\u5185\u90e8\u6e32\u67d3\u3002\u6362\u53e5\u8bdd\u8bf4\uff0cReact\u5143\u7d20\u4e2d\u7684\u5b50\u7ec4\u4ef6\uff0c\u5728DOM\u4e2d\uff0c\u4e5f\u4f1a\u662f\u5176\u7236\u7ec4\u4ef6\u5bf9\u5e94DOM\u7684\u540e\u4ee3\u5143\u7d20\u3002<\/p>\n\n\n\n

\u4f46\u662f\uff0c\u5728\u6709\u4e9b\u573a\u666f\u4e0b\u5982\u679c\u5c06\u5b50\u7ec4\u4ef6\u76f4\u63a5\u6e32\u67d3\u4e3a\u7236\u7ec4\u4ef6\u7684\u540e\u4ee3\uff0c\u5728\u7f51\u9875\u663e\u793a\u65f6\u4f1a\u51fa\u73b0\u4e00\u4e9b\u95ee\u9898\u3002\u6bd4\u5982\uff0c\u9700\u8981\u5728React\u4e2d\u6dfb\u52a0\u4e00\u4e2a\u4f1a\u76d6\u4f4f\u5176\u4ed6\u5143\u7d20\u7684Backdrop\u7ec4\u4ef6\uff0cBackdrop\u663e\u793a\u540e\uff0c\u9875\u9762\u4e2d\u6240\u6709\u7684\u5143\u7d20\u90fd\u4f1a\u88ab\u906e\u76d6\u3002\u5f88\u663e\u7136\u8fd9\u91cc\u9700\u8981\u7528\u5230\u5b9a\u4f4d\uff0c\u4f46\u662f\u5982\u679c\u5c06\u906e\u7f69\u5c42\u76f4\u63a5\u5728\u5f53\u524d\u7ec4\u4ef6\u4e2d\u6e32\u67d3\u7684\u8bdd\uff0c\u906e\u7f69\u5c42\u4f1a\u6210\u4e3a\u5f53\u524d\u7ec4\u4ef6\u7684\u540e\u4ee3\u5143\u7d20\u3002\u5982\u679c\u6b64\u65f6\uff0c\u5f53\u524d\u5143\u7d20\u540e\u8fb9\u7684\u5144\u5f1f\u5143\u7d20\u4e2d\u6709\u5f00\u542f\u5b9a\u4f4d\u7684\u60c5\u51b5\u51fa\u73b0\uff0c\u4e14\u5c42\u7ea7\u4e0d\u4f4e\u4e8e\u5f53\u524d\u5143\u7d20\u65f6\uff0c\u4fbf\u4f1a\u51fa\u73b0\u76d6\u4f4f\u906e\u7f69\u5c42\u7684\u60c5\u51b5\u3002<\/p>\n\n\n\n

const Backdrop = () => {\n  return <div\n           style={\n      {\n        position:'fixed',\n        top:0,\n        bottom:0,\n        left:0,\n        right:0,\n        background:'rgba(0,0,0,.3)',\n        zIndex:9999\n      }\n    }\n           >\n    \n  <\/div>\n};\n\nconst Box = props => {\n  return <div\n           style={\n      {\n        width:100,\n        height:100,\n        background:props.bgColor\n      }\n    }\n           >\n             {props.children}\n           <\/div>\n};\n\nconst App = () => {\n  return <div>\n    \n    <Box bgColor='yellowgreen'>\n    <Backdrop\/>\n    <\/Box>\n    <Box bgColor='orange' \/>\n    \n  <\/div>;\n};\n\n\nReactDOM.render(\n  <App\/>,\n  document.getElementById('root')\n);\n<\/code><\/pre>\n\n\n\n
\u4e0a\u4f8b\u4ee3\u7801\u4e2d\uff0cApp\u7ec4\u4ef6\u4e2d\u5f15\u5165\u4e86\u4e24\u4e2aBox\u7ec4\u4ef6\uff0c\u4e00\u4e2a\u7eff\u8272\uff0c\u4e00\u4e2a\u6a59\u8272\u3002\u7eff\u8272\u7ec4\u4ef6\u4e2d\u5f15\u5165\u4e86Backdrop\u7ec4\u4ef6\uff0cBackdrop\u7ec4\u4ef6\u662f\u4e00\u4e2a\u906e\u7f69\u5c42\uff0c\u53ef\u4ee5\u5728\u8986\u76d6\u4f4f\u6574\u4e2a\u7f51\u9875\u3002<\/p>\n\n\n\n
\u73b0\u5728\u4e09\u4e2a\u7ec4\u4ef6\u7684\u5173\u7cfb\u662f\uff0c\u7eff\u8272Box\u662f\u6a59\u8272Box\u7684\u5144\u5f1f\u5143\u7d20\uff0cBackdrop\u662f\u7eff\u8272Box\u7684\u5b50\u5143\u7d20\u3002\u5982\u679cBox\u7ec4\u4ef6\u6ca1\u6709\u5f00\u542f\u5b9a\u4f4d\uff0c\u906e\u7f69\u5c42\u53ef\u4ee5\u6b63\u5e38\u663e\u793a\u8986\u76d6\u6574\u4e2a\u9875\u9762\u3002<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
Backdrop\u80fd\u591f\u76d6\u4f4f\u9875\u9762<\/p>\n\n\n\n
\u4f46\u662f\u5982\u679c\u4e3aBox\u5f00\u542f\u5b9a\u4f4d\uff0c\u5e76\u8bbe\u7f6e\u5c42\u7ea7\u4f1a\u51fa\u73b0\u4ec0\u4e48\u60c5\u51b5\u5462\uff1f<\/p>\n\n\n\n
const Box = props => {\n  return <div\n           style={\n      {\n        width:100,\n        height:100,\n        background:props.bgColor,\n        position:'relative',\n        zIndex:1\n      }\n    }\n           >\n             {props.children}\n           <\/div>\n};<\/code><\/pre>\n\n\n\n
\u73b0\u5728\u4fee\u6539Box\u7ec4\u4ef6\uff0c\u5f00\u542f\u76f8\u5bf9\u5b9a\u4f4d\uff0c\u5e76\u8bbe\u7f6e\u4e86z-index\u4e3a1\uff0c\u7ed3\u679c\u9875\u9762\u53d8\u6210\u4e86\u8fd9\u4e2a\u6837\u5b50\uff1a<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u548c\u4e0a\u56fe\u5bf9\u6bd4\uff0c\u663e\u7136\u6a59\u8272\u7684box\u6ca1\u6709\u88ab\u76d6\u4f4f\uff0c\u8fd9\u662f\u4e3a\u4ec0\u4e48\u5462\uff1f\u9996\u5148\u6211\u4eec\u6765\u770b\u770b\u4ed6\u4eec\u7684\u7ed3\u6784\uff1a<\/p>\n\n\n\n
<App>\n    <\u7eff\u8272Box>\n            <\u906e\u7f69\/>\n    <\/\u7eff\u8272Box>\n    <\u6a59\u8272Box\/>\n<\/App><\/code><\/pre>\n\n\n\n
\u7eff\u8272Box\u548c\u6a59\u8272Box\u90fd\u5f00\u542f\u4e86\u5b9a\u4f4d\uff0c\u4e14z-index\u76f8\u540c\u90fd\u4e3a1\uff0c\u4f46\u662f\u7531\u4e8e\u6a59\u8272\u5728\u540e\u8fb9\uff0c\u6240\u4ee5\u5b9e\u9645\u5c42\u7ea7\u662f\u9ad8\u4e8e\u7eff\u8272\u7684\u3002\u7531\u4e8e\u7eff\u8272\u662f\u906e\u7f69\u5c42\u7684\u7236\u5143\u7d20\uff0c\u6240\u4ee5\u5373\u4f7f\u906e\u7f69\u7684\u5c42\u7ea7\u662f9999\u4e5f\u4f9d\u7136\u76d6\u4e0d\u4f4f\u6a59\u8272\u3002<\/p>\n\n\n\n
\u95ee\u9898\u51fa\u5728\u4e86\u54ea\uff1f\u906e\u7f69\u5c42\u7684\u4f5c\u7528\uff0c\u662f\u7528\u6765\u76d6\u4f4f\u5176\u4ed6\u5143\u7d20\u7684\uff0c\u5b83\u672c\u5c31\u4e0d\u8be5\u4f5c\u4e3aBox\u7684\u5b50\u5143\u7d20\u51fa\u73b0\uff0c\u4f5c\u4e3a\u5b50\u5143\u7d20\u4e86\uff0c\u5c31\u96be\u514d\u4f1a\u51fa\u73b0\u7c7b\u4f3c\u95ee\u9898\u3002\u6240\u4ee5\u6211\u4eec\u9700\u8981\u5728Box\u4e2d\u4f7f\u7528\u906e\u7f69\uff0c\u4f46\u662f\u53c8\u4e0d\u80fd\u4f7f\u4ed6\u6210\u4e3aBox\u7684\u5b50\u5143\u7d20\u3002\u600e\u4e48\u529e\u5462\uff1fReact\u4e3a\u6211\u4eec\u63d0\u4f9b\u4e86\u4e00\u4e2a\u201c\u4f20\u9001\u95e8\u201d\u53ef\u4ee5\u5c06\u5143\u7d20\u4f20\u9001\u5230\u6307\u5b9a\u7684\u4f4d\u7f6e\u4e0a\u3002<\/p>\n\n\n\n
\u901a\u8fc7ReactDOM\u4e2d\u7684createPortal()\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5728\u6e32\u67d3\u5143\u7d20\u65f6\u5c06\u5143\u7d20\u6e32\u67d3\u5230\u7f51\u9875\u4e2d\u7684\u6307\u5b9a\u4f4d\u7f6e\u3002\u8fd9\u4e2a\u65b9\u6cd5\u5c31\u548c\u4ed6\u7684\u540d\u5b57\u4e00\u6837\uff0c\u7ed9React\u5143\u7d20\u5f00\u542f\u4e86\u4e00\u4e2a\u4f20\u9001\u95e8\uff0c\u8ba9\u5b83\u53ef\u4ee5\u53bb\u5230\u5b83\u5e94\u8be5\u53bb\u7684\u5730\u65b9\u3002<\/p>\n\n\n\n
portal\u7684\u7528\u6cd5<\/h2>\n\n\n\n
  1. \u5728index.html\u4e2d\u6dfb\u52a0\u4e00\u4e2a\u65b0\u7684\u5143\u7d20<\/li>
  2. \u5728\u7ec4\u4ef6\u4e2d\u4e2d\u901a\u8fc7ReactDOM.createPortal()\u5c06\u5143\u7d20\u6e32\u67d3\u5230\u65b0\u5efa\u7684\u5143\u7d20\u4e2d<\/li><\/ol>\n\n\n\n
    \u5728index.html\u4e2d\u6dfb\u52a0\u65b0\u5143\u7d20\uff1a<\/p>\n\n\n\n
    <div id=\"backdrop\"><\/div><\/code><\/pre>\n\n\n\n
    \u4fee\u6539Backdrop\u7ec4\u4ef6\uff1a<\/p>\n\n\n\n
    const backdropDOM = document.getElementById('backdrop');\n\nconst Backdrop = () => {\n  return ReactDOM.createPortal(\n  <div\n           style={\n      {\n        position:'fixed',\n        top:0,\n        bottom:0,\n        left:0,\n        right:0,\n        zIndex:9999,\n        background:'rgba(0,0,0,.3)'\n      }\n    }\n           >\n  <\/div>,\n      backdropDOM\n  );\n};<\/code><\/pre>\n\n\n\n
    \u5982\u6b64\u4e00\u6765\uff0c\u6211\u4eec\u867d\u7136\u662f\u5728Box\u4e2d\u5f15\u5165\u4e86Backdrop\uff0c\u4f46\u662f\u7531\u4e8e\u5728Backdrop\u4e2d\u5f00\u542f\u4e86\u201c\u4f20\u9001\u95e8\u201d\uff0cBackdrop\u5c31\u4f1a\u76f4\u63a5\u6e32\u67d3\u5230\u7f51\u9875\u4e2did\u4e3abackdrop\u7684div\u4e2d\uff0c\u8fd9\u6837\u4e00\u6765\u4e0a\u8fb9\u7684\u95ee\u9898\u5c31\u89e3\u51b3\u4e86\uff01\u563f\u563f\uff0c\u4e0d\u9519\u5427\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u5728React\u4e2d\uff0c\u7236\u7ec4\u4ef6\u5f15\u5165\u5b50\u7ec4\u4ef6\u540e\uff0c\u5b50\u7ec4\u4ef6\u4f1a\u76f4\u63a5\u5728\u7236\u7ec4\u4ef6\u5185\u90e8\u6e32\u67d3\u3002\u6362\u53e5\u8bdd\u8bf4\uff0cReact\u5143\u7d20\u4e2d\u7684\u5b50\u7ec4\u4ef6\uff0c\u5728DOM […]<\/p>\n","protected":false},"author":1,"featured_media":5765,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[198],"tags":[200,222,202,199],"_links":{"self":[{"href":"https:\/\/lilichao.com\/index.php?rest_route=\/wp\/v2\/posts\/5764"}],"collection":[{"href":"https:\/\/lilichao.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lilichao.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lilichao.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lilichao.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5764"}],"version-history":[{"count":3,"href":"https:\/\/lilichao.com\/index.php?rest_route=\/wp\/v2\/posts\/5764\/revisions"}],"predecessor-version":[{"id":6420,"href":"https:\/\/lilichao.com\/index.php?rest_route=\/wp\/v2\/posts\/5764\/revisions\/6420"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lilichao.com\/index.php?rest_route=\/wp\/v2\/media\/5765"}],"wp:attachment":[{"href":"https:\/\/lilichao.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5764"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lilichao.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5764"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lilichao.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5764"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}