题解 | #表格排序#

function sort(type, order) {
    const frag = document.createDocumentFragment();
    const trList = [].slice.call(jsList.children,0);
    const len = trList.length;
    let col;
    switch(type) {
        case 'id':
            col = 0;
            break;
        case 'price':
            col = 1;
            break;
        case 'sales':
            col = 2;
            break;
        default:
            col = 0;
            break;
    }
    const fn = order == 'asc' 
                ? (a,b) => getVal(a,col) - getVal(b,col)
                : (a,b) =>getVal(b,col) - getVal(a,col);
    trList.sort(fn);
    
    for(let i = 0; i<len; i++) {
        frag.append(trList[i]);
    }
    
    jsList.innerHTML = '';
    jsList.append(frag);
}

function getVal(target,col) {
    return target.children[col].innerText * 1;
}
sort('sales','asc');