javascript小例子

创建表：

/** * Created by fhqplzj on 2017/7/13. */function create_table(n_rows, n_cols) {    var table = '<table border="1" width="500" cellspacing="0" cellpadding="5">';    for (var i = 1; i <= n_rows; i++) {        var a_line = '<tr>';        for (var j = 1; j <= n_cols; j++) {            a_line += '<td>' + i * j + '</td>'        }        a_line += '</tr>';        table += a_line    }    table += '</table>';    document.writeln(table)}create_table(5, 10);