如何在列中设置条件

Question

我尝试在箭头函数之后设置括号{}，但结果总是为空

return Array.from(columns, column => column.innerText);

我想这样设置:

return Array.from(rows, row => {
const columns = row.querySelectorAll('td');
return Array.from(columns, column => {
if(column.href.includes('new-york-time')){
console.log('well link')
}
column.innerText;
});

Answer 1

Array.from期望在回调函数中返回值，但是您还没有从中返回任何值

你可以查看这些例子

没有括号-直接返回column.innerText

return Array.from(columns, column => column.innerText); //correct

括号和不返回(不正确)

return Array.from(columns, column => {
column.innerText //incorrect
});

括号和返回符(正确)

return Array.from(columns, column => {
return column.innerText //correct
});

根据您的情况，您可以这样修改

return Array.from(rows, row => {
const columns = row.querySelectorAll('td');
return Array.from(columns, column => {
if(column.href.includes('new-york-time')){
//TODO: Do something with your condition
console.log('well link')
}
return column.innerText; //return here
});