【web电子表格】数据过长时，显示省略号

function main(page: IPage, portlet: ITableSheetPortlet) {
    let r = portlet.getRowCount(); //获取电子表格总行数
    for (let i = 2; i < r - 1; i++) {
        // 设置类别
        let cell = portlet.getCell(i, 1); //根据行列号获取单元格
        truncateCellInnerText(cell, 5); //设置显示的字符个数
        // 设置名称
        cell = portlet.getCell(i, 2);
        truncateCellInnerText(cell, 2);
        //设置数量
        cell = portlet.getCell(i, 3);
        truncateCellInnerText(cell, 4);
    }    
}

// 如果单元格内容超出指定长度、将其截短
function truncateCellInnerText(cell: ISheetCell, textMaxLength: number) {
    if (!cell) {
        return;
    }
    let len = textMaxLength || 10;
    let txt = cell.getText();
    if (txt.length > len) {
        cell.setText(txt.substring(0, len) + "...");
        cell.setAttribute("title", txt);
    }
}

function strlen(str: string) {
    let len = 0;
    for (let i = 0; i < str.length; i++) {
        let c = str.charCodeAt(i);
        //单字节加1
        if ((c >= 0x0001 && c <= 0x007e) || (0xff60 <= c && c <= 0xff9f)) {
            len++;
        } else {
            len += 2;
        }
    }
    return len;
}