解决iview多表头动态更改列元素发生的错误的方法

作者：袖梨 2022-06-25

解决iview 'You may have an infinite update loop in watcher with expression "columns"'

解决方案

单表头是可以动态变化不需要增添什么东西

多表头目前iview尚不能动态变化，会报错You may have an infinite update loop in watcher with expression "columns"解决方法是github大神提供的：需要

将iview.js中 

columns: {
  handler: function handler() {
    var colsWithId = this.makeColumnsId(this.columns);
    his.allColumns = (0, _util.getAllColumns)(colsWithId);
    this.cloneColumns = this.makeColumns(colsWithId);

    this.columnRows = this.makeColumnRows(false, colsWithId);
    this.leftFixedColumnRows = this.makeColumnRows('left', colsWithId);
    this.rightFixedColumnRows = this.makeColumnRows('right', colsWithId);
    this.rebuildData = this.makeDataWithSortAndFilter();
    this.handleResize();
    },
   deep: true
  },

修改为 

columns: {
   handler: function handler() {
     //[Fix Bug]You may have an infinite update loop in watcher with expression "columns"
     var tempClonedColumns = (0, _assist.deepCopy)(this.columns);
     var colsWithId = this.makeColumnsId(tempClonedColumns);
     //[Fix Bug End]
     this.allColumns = (0, _util.getAllColumns)(colsWithId);
     this.cloneColumns = this.makeColumns(colsWithId);

     this.columnRows = this.makeColumnRows(false, colsWithId);
     this.leftFixedColumnRows = this.makeColumnRows('left', colsWithId);
     this.rightFixedColumnRows = this.makeColumnRows('right', colsWithId);
     this.rebuildData = this.makeDataWithSortAndFilter();
     this.handleResize();
     },
   deep: true
   },

demo

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