JS实现字符点点loading效果

<style>
	dot {
		display: inline-block; 
		height: 1em; 
		line-height: 1;
		text-align: left;
		vertical-align: -.25em;
		overflow: hidden;
	}
	dot::before {
		display: block;
		content: '...\A..\A.';
		white-space: pre-wrap;   /* 也可以是white-space: pre */
		animation: dot 1s infinite step-start both;
	}
	@keyframes dot {
		33% { transform: translateY(-2em); }
		66% { transform: translateY(-1em); }
	}
</style>

提交中<dot>...</dot>
<style