js添加子元素 table tr td createElement

js代码：增加一行五列的表格

function AddList(){
    obj = document.getElementById(‘tab_g‘);    

    $str1 = ‘1‘;
    $str2 = ‘2‘;
    $str3 = ‘3‘;
    $str4 = ‘4‘;
    $str5 = ‘5‘;

    newTr = document.createElement(‘tr‘);
    newTd1 = document.createElement(‘td‘);
    newTd2 = document.createElement(‘td‘);
    newTd3 = document.createElement(‘td‘);
    newTd4 = document.createElement(‘td‘);
    newTd5 = document.createElement(‘td‘);

    newTd1.innerHTML = $str1;
    newTd2.innerHTML = $str2;
    newTd3.innerHTML = $str3;
    newTd4.innerHTML = $str4;
    newTd5.innerHTML = $str5;

    newTr.appendChild(newTd1);
    newTr.appendChild(newTd2);
    newTr.appendChild(newTd3);
    newTr.appendChild(newTd4);
    newTr.appendChild(newTd5);

    document.getElementById(‘tab_g‘).appendChild(newTr)
}