<div id="contentdiv">
    <div id="startdiv">
        <button onclick="begin()">开始游戏</button>
    </div>
    <div id="maindiv">
        <div id="scorediv">
            <label>分数：</label>
            <label id="label">0</label>
        </div>
        <div id="suspenddiv">
            <button>继续</button><br/>
            <button>重新开始</button><br/>
            <button>回到主页</button>
        </div>
        <div id="enddiv">
            <p class="plantext">飞机大战分数</p>
            <p id="planscore">0</p>
            <div><button onclick="jixu()">继续</button></div>
        </div>
    </div>
</div>