普通报表设置下拉复选框控件默认全选，定义初始化事件this.changeAllState();报错：CustomJSError : this.changeAllState is not a funct
this.doSelectAll();//默认全选this.setText(this.getText());//赋显示值
参考：JS实现下拉复选框默认全选-https://help.fanruan.com/finereport/doc-view-3783.html
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