一楼有bug，正确代码如下：

var
    b,c,i,j,
    list = document.getElementById('test-list');
    for (i = 0; i < list.children.length - 1; i++) {
        c = list.children[i]; 
        for (j = i + 1; j < list.children.length; j++){
            b = list.children[j]; 
            if ( b.innerText < c.innerText ){
                list.insertBefore(b, c);
                c = list.children[i]; //补充此行
            }
        }
    }