前端打印

1.定义变量配置dom模板

let template = ''
        this.Inselect.forEach(item => {
          template +=
            `<div>
               <div class="print-top">
                 <span>案件信息</span>
               </div>
               <div class="print-box">
                 <div class="print-left">
                   <div><span>事件名称：</span><span>${item.eventName}</span></div>
                   <div><span>报警人：</span><span>${item.person}</span></div>
                   <div><span>性别：</span><span>${item.gender === 2 ? '女' : '男'}</span></div>
                   <div><span>年龄：</span><span>${item.age}</span></div>
                   <div><span>民族/国籍：</span><span>${item.nationality}</span></div>
                   <div><span>院系/单位：</span><span>${item.department}</span></div>
                   <div><span>住址：</span><span>${item.address}</span></div>
                   <div><span>联系电话：</span><span>${item.phone}</span></div>
                   <div><span>备注：</span><span>${item.mark}</span></div>
                 </div>
                 <div class="print-right">
                   <div><span>事发地点：</span><span>${item.incidentAddress}</span></div>
                   <div><span>学号：</span><span>${item.studentNum}</span></div>
                   <div><span>身份证号：</span><span>${item.identityNum}</span></div>
                   <div><span>是否调取录像：</span><span>${item.isRecode === true ? '是' : '否'}</span></div>
                   <div><span>案件开始时间：</span><span>${item.alarmTime ? this.$moment(item.alarmTime).format('YYYY-MM-DD HH:mm:ss') : ''}</span></div>
                   <div><span>案件结束时间：</span><span>${item.endTime ? this.$moment(item.endTime).format('YYYY-MM-DD HH:mm:ss') : ''}</span></div>
                   <div><span>登记时间：</span><span>${item.createTime ? this.$moment(item.createTime).format('YYYY-MM-DD HH:mm:ss') : ''}</span></div>
                   <div><span>事件特征：</span><span>${item.description}</span></div>
                 </div>
               </div>
             </div>`
        })

2.将dom模板配置到打印页面的body中

        const el = document.createElement('div')
        el.innerHTML = template
        document.body.appendChild(el)

3.调用打印方法，完成打印

        window.print()
        document.body.removeChild(el)

4.注意点（如果只打印配置的dom模板，需要在css中隐藏其他不需要打印的dom，配置方法）

@media print {
  #app-main {
    display: none;
  }
}