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   | <el-button type="primary" @click="create">确认</el-button> <el-dialog       :title="ruleTitle"       :visible.sync="showRule"       width="70%"       :append-to-body="true"       :before-close="handleClose"     >     ...     ...     ... </el-dialog>
  //el-dialog出现之后进行监听 create(){     this.showRule=true;     this.$nextTick(() => {         document.addEventListener('scroll', this.handleScroll, true);     }); }, //监听滚动 handleScroll() {   let sch = document.getElementsByClassName("el-dialog__body")[0].scrollHeight;//内容的高度   let cih = document.getElementsByClassName("el-dialog__body")[0].clientHeight;//框的高度,固定的   let sct = document.getElementsByClassName("el-dialog__body")[0].scrollTop;//滚动的高度   // console.log(sch, cih, sct);   if (sct >= sch - cih) {     //滚动条拉到底部了,在这里做一些事情     ...   } },
  // 在el-dialog关闭之前删除监听 handleClose(done) {   document.removeEventListener("scroll", this.handleScroll, true);   done(); },
 
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