Element-UI踩坑之Pagination组件的使用

<el-pagination 
 @size-change="handleSizeChange" 
 @current-change="handleCurrentChange" 
 :page-size="pageSize" 
 :current-page="currentPage"
 :total="total"
 :page-sizes="[10, 20, 50, 100, 200, 300, 400]" 
 layout="total, sizes, prev, pager, next, jumper">
</el-pagination>

getData() {
 const params = {
 pageSize: this.pageSize,
 currentPage: this.currentPage
 };

 get(params).then(res => {
 if (res.status === 0) {
 ...
 this.total = res.result.count;
 }
 });
}

handleSizeChange(val) {
 this.pageSize = val;
 this.getData();
},
handleCurrentChange(val) {
 this.currentPage = val;
 this.getData();
}

watch: {
 internalCurrentPage: {
 immediate: true,
 handler(newVal, oldVal) {
 newVal = parseInt(newVal, 10);

 /* istanbul ignore if */
 if (isNaN(newVal)) {
  newVal = oldVal || 1;
 } else {
  // 注意这里 
  newVal = this.getValidCurrentPage(newVal);
 }

 if (newVal !== undefined) {
  this.internalCurrentPage = newVal;
  if (oldVal !== newVal) {
  this.$emit('currentPage', newVal);
  }
 } else {
  this.$emit('currentPage', newVal);
 }
 }
 }
}

newVal = this.getValidCurrentPage(newVal)

getValidCurrentPage(value) {
 value = parseInt(value, 10);
 
 const havePageCount = typeof this.internalPageCount === 'number';

 let resetValue;
 if (!havePageCount) {
 if (isNaN(value) || value < 1) resetValue = 1;
 } else {
 if (value < 1) {
  resetValue = 1;
 } else if (value > this.internalPageCount) {
  // 注意这里
  resetValue = this.internalPageCount;
 }
 }

 if (resetValue === undefined && isNaN(value)) {
 resetValue = 1;
 } else if (resetValue === 0) {
 resetValue = 1;
 }

 return resetValue === undefined ? value : resetValue;
 }

else if (value > this.internalPageCount) {
 resetValue = this.internalPageCount;
}