<div class="container" id="app">
        <h1>复制图片</h1>
        <div class="input-group ma-b-10">
            <span class="input-group-addon" id="basic-addon3">粘贴</span>
            <input ref="input" type="text" class="form-control" id="basic-url" aria-describedby="basic-addon3">
        </div>
        <div class="card ma-b-10">
            <div class="card-body">
                <h4 class="card-title">
                    获得base64数据
                </h4>
                 
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