unity打包webgl后，使用WebGLInput实现中文输入，在使用默认的全屏方法 unityInstance.SetFullscreen(1)时，出现了无法输入中文，英文数字输入倒序等问题，所以重新处理了全屏方法。下面代码是用unity2022.3.57版本打webgl包后修改的index文件

<!DOCTYPE html>
<html lang="en-us">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <title>Unity WebGL Player | Web Demo</title>
    <link rel="shortcut icon" href="TemplateData/favicon.ico">
    <link rel="stylesheet" href="TemplateData/style.css">
    		<style>
			/* 兼容全屏状态 */
			:fullscreen #unity-container,
			:-webkit-full-screen #unity-container {
				width: 100vw !important;
				height: 100vh !important;
			}

			 :fullscreen #unity-canvas,
			:-webkit-full-screen #unity-canvas {
				width: 100vw !important;
				height: 100vh !important;
			} 
		</style>
  </head>
  <body>
    <div id="unity-container" class="unity-desktop">
      <canvas id="unity-canvas" width=960 height=600></canvas>
      <div id="unity-loading-bar">
        <div id="unity-logo"></div>
        <div id="unity-progress-bar-empty">
          <div id="unity-progress-bar-full"></div>
        </div>
      </div>
      <div id="unity-warning"> </div>
      <div id="unity-footer">
        <div id="unity-webgl-logo"></div>
        <div id="unity-fullscreen-button"></div>
        <div id="unity-build-title">Web Demo</div>
      </div>
    </div>
    <script>
      var container = document.querySelector("#unity-container");
      var canvas = document.querySelector("#unity-canvas");
      var loadingBar = document.querySelector("#unity-loading-bar");
      var progressBarFull = document.querySelector("#unity-progress-bar-full");
      var fullscreenButton = document.querySelector("#unity-fullscreen-button");
      var warningBanner = document.querySelector("#unity-warning");

      // Shows a temporary message banner/ribbon for a few seconds, or
      // a permanent error message on top of the canvas if type=='error'.
      // If type=='warning', a yellow highlight color is used.
      // Modify or remove this function to customize the visually presented
      // way that non-critical warnings and error messages are presented to the
      // user.
      function unityShowBanner(msg, type) {
        function updateBannerVisibility() {
          warningBanner.style.display = warningBanner.children.length ? 'block' : 'none';
        }
        var div = document.createElement('div');
        div.innerHTML = msg;
        warningBanner.appendChild(div);
        if (type == 'error') div.style = 'background: red; padding: 10px;';
        else {
          if (type == 'warning') div.style = 'background: yellow; padding: 10px;';
          setTimeout(function() {
            warningBanner.removeChild(div);
            updateBannerVisibility();
          }, 5000);
        }
        updateBannerVisibility();
      }

      var buildUrl = "Build";
      var loaderUrl = buildUrl + "/WebDemo.loader.js";
      var config = {
        dataUrl: buildUrl + "/WebDemo.data.unityweb",
        frameworkUrl: buildUrl + "/WebDemo.framework.js.unityweb",
        codeUrl: buildUrl + "/WebDemo.wasm.unityweb",
        streamingAssetsUrl: "StreamingAssets",
        companyName: "DefaultCompany",
        productName: "Web Demo",
        productVersion: "0.1",
        showBanner: unityShowBanner,
      };

      // By default Unity keeps WebGL canvas render target size matched with
      // the DOM size of the canvas element (scaled by window.devicePixelRatio)
      // Set this to false if you want to decouple this synchronization from
      // happening inside the engine, and you would instead like to size up
      // the canvas DOM size and WebGL render target sizes yourself.
      // config.matchWebGLToCanvasSize = false;

      if (/iPhone|iPad|iPod|Android/i.test(navigator.userAgent)) {
        // Mobile device style: fill the whole browser client area with the game canvas:

        var meta = document.createElement('meta');
        meta.name = 'viewport';
        meta.content = 'width=device-width, height=device-height, initial-scale=1.0, user-scalable=no, shrink-to-fit=yes';
        document.getElementsByTagName('head')[0].appendChild(meta);
        container.className = "unity-mobile";
        canvas.className = "unity-mobile";

        // To lower canvas resolution on mobile devices to gain some
        // performance, uncomment the following line:
        // config.devicePixelRatio = 1;

        unityShowBanner('WebGL builds are not supported on mobile devices.');
      } else {
        // Desktop style: Render the game canvas in a window that can be maximized to fullscreen:

        canvas.style.width = "960px";
        canvas.style.height = "600px";
      }

      loadingBar.style.display = "block";


      var script = document.createElement("script");
      script.src = loaderUrl;
      script.onload = () => {
        createUnityInstance(canvas, config, (progress) => {
          progressBarFull.style.width = 100 * progress + "%";
        }).then((unityInstance) => {
          loadingBar.style.display = "none";

          fullscreenButton.onclick = () => {
            // unityInstance.SetFullscreen(1);
            	fullscreen();
          };
        }).catch((message) => {
          alert(message);
        });
      };
      document.body.appendChild(script);

			//全屏
			function fullscreen() {
				console.log('全屏')
				document.documentElement.requestFullscreen();
				// 进入全屏时隐藏滚动条
				document.body.style.overflow = 'hidden';
			}




			// 监听全屏变化，退出全屏时恢复显示和滚动条
			document.addEventListener('fullscreenchange', () => {
				if (!document.fullscreenElement) {
					// 退出全屏时恢复滚动条
					document.body.style.overflow = 'auto';
				}
			});

    </script>
  </body>
</html>