CSS搜索框加载等待动画
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var search = document.getElementById('search');
var button = document.getElementById('button');
var input = document.getElementById('input');
function loading() {
search.classList.add('loading');
setTimeout(function() {
search.classList.remove('loading');
}, 1500);
}
button.addEventListener('click', loading);
input.addEventListener('keydown', function() {
if(event.keyCode == 13) loading();
});