获取表格每一列求和并存入数组中

//行数
let rows = table.rows.length
//列数
let cols = table.rows.item(0).cells.length ;
let sum = 0;
let arr = []
//
for(let i=0;i<cols;i++) {
    //除去第一行表头
    for(let j=1;j<rows;j++) {
        let cell = table.rows[j].cells[i].innerText
        if (cell != null && cell != '') {
            let val = parseFloat(cell)
            sum += val
        }
    }
    arr.push(str)
    str = 0
}