Question

谁能帮我把document.getElementById取值换成根据class取值，必有重谢

function SlideShow(c) {
var a = document.getElementById("slideContainer"), f = document.getElementById("slidesImgs").getElementsByTagName("li"), h = document.getElementById("slideBar"), n = h.getElementsByTagName("li"), d = f.length, c = c || 3000, e = lastI = 0, j, m;
function b() {
m = setInterval(function () {
e = e + 1 >= d ? e + 1 - d : e + 1;
g()
}, c)
}
function k() {
clearInterval(m)
}
function g() {
f[lastI].style.display = "none";
n[lastI].className = "";
f[e].style.display = "block";
n[e].className = "on";
lastI = e
}
f[e].style.display = "block";
a.onmouseover = k;
a.onmouseout = b;
h.onmouseover = function (i) {
j = i ? i.target : window.event.srcElement;
if (j.nodeName === "LI") {
e = parseInt(j.innerHTML, 10) - 1;
g()
}
};
b()
}
;

谁能帮我将这个改为根据class取值

Answer 1

var $container = document.getElementById('container');
var $ul = $container.getElementsByTagName('ul');

// 要取的class
var className = 'col';

var ulCollection = [];

for (var i = 0; i < $ul.length; i += 1) {
var ul = $ul[i],
classList = ul.className.split(' ');
for (var j = 0; j < classList.length; j += 1) {
if (className === classList[j]) {
ulCollection.push(ul);
break;
}
}
}

console.log(ulCollection);

追问

我是一个新手，还是不明白，要是你能直接把上面贴的改好就更好了