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);
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