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HTML

              
                <body onload="onload()">
    <div class="container">
        <h1>营销号生成器</h1>
        <div class="row">
            <div class="col-sm-5 col-xs-12">
                <form action="javascript:void(0);" autocomplete="off">
                    <div class="form-group">
                        <lable for="subject">主体:</lable>
                        <input type="text" id="subject" class="form-control" placeholder="桃子核" required />
                    </div>
                    <div class="form-group">
                        <lable for="event">事件:</lable>
                        <input type="text" id="event" class="form-control" placeholder="不能吞下去" required />
                    </div>
                    <div class="form-group">
                        <lable for="event2">另一种说法:</lable>
                        <input type="text" id="event2" class="form-control" placeholder="桃核太大了,吞下去容易噎着" required />
                    </div>
                    <input type="submit" value="生成" class="btn btn-primary" onclick="generate()" />
                </form>
            </div>
            <div class="col-sm-7 col-xs-12">
                <textarea id="result" onchange="auto_grow(this)" oninput="auto_grow(this)"
                    placeholder="  桃子核不能吞下去是怎么回事呢?桃子核相信大家都很熟悉,但是桃子核不能吞下去是怎么回事呢,下面就让小编带大家一起了解吧。&#013;&#010;  桃子核不能吞下去,其实就是桃核太大了,吞下去容易噎着,大家可能会很惊讶桃子核怎么会不能吞下去呢?但事实就是这样,小编也感到非常惊讶。&#013;&#010;  这就是关于桃子核不能吞下去的事情了,大家有什么想法呢,欢迎在评论区告诉小编一起讨论哦!"></textarea>
            </div>
        </div>
    </div>
    <hr />
    <div id="footer">
        Made by: Kasei
        <br />
        <a href="http://kaseidis.gitee.io/interesting_gadgets/marketing_generator/index.htm" target="_blank">大陆镜像</a>
    </div>
</body>
              
            
!

CSS

              
                textarea {
    resize: none;
    overflow: hidden;
    width: 100%;
    min-height: 50px;
}
lable {
    font-weight: bold;
}

#footer {
    text-align: center;
}
button {
    margin-bottom: 10px;
}
              
            
!

JS

              
                function auto_grow(element) {
    element.style.height = "5px";
    element.style.height = (element.scrollHeight)+"px";
}

function onload() {
    auto_grow(document.getElementById("result"));
}

function generate() {
    subject = document.getElementById("subject").value;
    event = document.getElementById("event").value;
    event2 = document.getElementById("event2").value;
    if (subject.length==0 || event.length==0 || event2.length==0)
        return;
    result = `  ${subject}${event}是怎么回事呢?${subject}相信大家都很熟悉,但是${subject}${event}是怎么回事呢,下面就让小编带大家一起了解吧。\r\n  ${subject}${event},其实就是${event2},大家可能会很惊讶${subject}怎么会${event}呢?但事实就是这样,小编也感到非常惊讶。\r\n  这就是关于${subject}${event}的事情了,大家有什么想法呢,欢迎在评论区告诉小编一起讨论哦!`;
    document.getElementById("result").value = result;
    auto_grow(document.getElementById("result"));
}
              
            
!
999px

Console