我有以下代码：
componentWillMount() {
this.props.actions.A().then(result => {
this.setState({ a: result });
});
}
现在发生的事情是，如果我快速切换页面，我会收到警告：setState(...): Can only update a mounted or mounting...。
我可以做些什么来阻止这种情况？ （显然使用IsMounted属性可以解决它，但作为一个阅读它已过时）
答案 0 :(得分：0)
尝试使用import java.io.FileOutputStream;
import org.apache.poi.xwpf.usermodel.*;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.CTTblWidth;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.STTblWidth;
import java.math.BigInteger;
public class CreateWordTableColumnWidth {
public static void main(String[] args) throws Exception {
XWPFDocument document= new XWPFDocument();
XWPFParagraph paragraph = document.createParagraph();
XWPFRun run=paragraph.createRun();
run.setText("The Body:");
paragraph = document.createParagraph();
XWPFTable table = document.createTable(1, 2);
//values are in unit twentieths of a point (1/1440 of an inch)
table.setWidth(5*1440); //should be 5 inches width
//create CTTblGrid for this table with widths of the 2 columns.
//necessary for Libreoffice/Openoffice to accept the column widths.
//first column = 2 inches width
table.getCTTbl().addNewTblGrid().addNewGridCol().setW(BigInteger.valueOf(2*1440));
//other columns (only one in this case) = 3 inches width
for (int col = 1 ; col < 2; col++) {
table.getCTTbl().getTblGrid().addNewGridCol().setW(BigInteger.valueOf(3*1440));
}
//set width for first column = 2 inches
CTTblWidth tblWidth = table.getRow(0).getCell(0).getCTTc().addNewTcPr().addNewTcW();
tblWidth.setW(BigInteger.valueOf(2*1440));
//STTblWidth.DXA is used to specify width in twentieths of a point.
tblWidth.setType(STTblWidth.DXA);
//set width for second column = 3 inches
tblWidth = table.getRow(0).getCell(1).getCTTc().addNewTcPr().addNewTcW();
tblWidth.setW(BigInteger.valueOf(3*1440));
tblWidth.setType(STTblWidth.DXA);
XWPFTableRow tableRowOne = table.getRow(0);
tableRowOne.getCell(0).setText("CLientID");
tableRowOne.getCell(1).setText("CID001");
//create second row
XWPFTableRow tableRow2 = table.createRow();
tableRow2.getCell(0).setText("AccountID");
tableRow2.getCell(1).setText("ACCID001");
paragraph = document.createParagraph();
document.write(new FileOutputStream("CreateWordTableColumnWidth.docx"));
document.close();
}
}
生命周期钩子。所以它会是
componentDidMount这是FB所说的： ＆＃34;在装入组件后立即调用componentDidMount（）。需要DOM节点的初始化应该放在这里。如果需要从远程端点加载数据，这是实例化网络请求的好地方。在此方法中设置状态将触发重新渲染。＆＃34;