设置input不能输入空格

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   <input class="common-text required" id="imageUrl" name="title" size="50" value=""
                                   type="text" onkeyup="this.value=this.value.replace(/\s+/g,'')" placeholder="请输入图片地址">

 核心

onkeyup="this.value=this.value.replace(/\s+/g,'')"