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hello uni-app x
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新增web-view示例  
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<!DOCTYPE html>
<html>
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  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>本地网页</title>
    <style type="text/css">
      .btn {
        display: block;
        margin: 20px auto;
        padding: 5px;
        background-color: #007aff;
        border: 0;
        color: #ffffff;
        height: 40px;
        width: 200px;
      }
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      .btn-red {
        background-color: #dd524d;
      }
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      .btn-yellow {
        background-color: #f0ad4e;
      }
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      .desc {
        padding: 10px;
        color: #999999;
      }
    </style>
  </head>
  <body>
    <p class="desc">web-view 组件加载本地 html 示例，仅在 App 环境下生效。点击下列按钮，跳转至其它页面。</p>
    <div class="btn-list">
      <button class="btn" type="button" data-action="navigateTo">navigateTo</button>
      <button class="btn" type="button" data-action="redirectTo">redirectTo</button>
      <button class="btn" type="button" data-action="navigateBack">navigateBack</button>
      <button class="btn" type="button" data-action="reLaunch">reLaunch</button>
      <button class="btn" type="button" data-action="switchTab">switchTab</button>
    </div>
    <p class="desc">网页向应用发送消息。注意：小程序端应用会在此页面后退时接收到消息。</p>
    <div class="btn-list">
      <button class="btn btn-red" type="button" id="postMessage">postMessage</button>
    </div>
    <!-- uni 的 SDK -->
    <script type="text/javascript" src="uni.webview.1.5.5.js"></script>
    <script type="text/javascript">
      // document.addEventListener('UniAppJSBridgeReady', function() {
      document.querySelector('.btn-list').addEventListener('click', function(evt) {
        var target = evt.target;
        if (target.tagName === 'BUTTON') {
          var action = target.getAttribute('data-action');
          switch (action) {
            case 'switchTab':
              uni.switchTab({
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                url: '/pages/tabBar/API'
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              });
              break;
            case 'reLaunch':
              uni.reLaunch({
                url: '/pages/tabBar/component'
              });
              break;
            case 'navigateBack':
              uni.navigateBack({
                delta: 1
              });
              break;
            default:
              uni[action]({
                url: '/pages/component/button/button'
              });
              break;
          }
        }
      })
      // });
      document.querySelector("#postMessage").addEventListener('click', function() {
        window.__uniapp_x_.postMessage(JSON.stringify({
          data: {
            action: 'message'
          }
        }))
      })
    </script>
  </body>
</html>