elementui 更改样式问题

（1），修改全局的话，特别简单；直接在vue 中

<style >
<span class="token punctuation">.</span>el<span class="token operator">-</span>table th <span class="token punctuation">.</span>cell<span class="token punctuation">{</span>
	 color<span class="token punctuation">:</span><span class="token function">rgba</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span><span class="token number">0</span><span class="token punctuation">,</span><span class="token number">0</span><span class="token punctuation">,</span><span class="token number">0.5</span><span class="token punctuation">)</span><span class="token operator">!</span>important<span class="token punctuation">;</span>
	<span class="token punctuation">}</span>
	<span class="token punctuation">.</span>el<span class="token operator">-</span>table td <span class="token punctuation">.</span>cell<span class="token punctuation">{</span>
	  color<span class="token punctuation">:</span><span class="token function">rgba</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span><span class="token number">0</span><span class="token punctuation">,</span><span class="token number">0</span><span class="token punctuation">,</span><span class="token number">1.8</span><span class="token punctuation">)</span><span class="token operator">!</span>important<span class="token punctuation">;</span>
	<span class="token punctuation">}</span>

</style>

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#注意，一定不要写 scoped;因为是这私有的。这样就覆盖不了element-ui的样式了，层级不够高；
但是这么写也有一个弊端。会覆盖所有的页面同类名的，css全局的污染；不过还是有解决方法的；

		<div id="colorBox">
			<ul>
				<li>123</li>
				<li>321</li>
				<li>456</li>
				<li>654</li>
			</ul>
	</div>

<style >
/* 因为id是唯一的。所以就简单了解决了这个’污染’*/
#colorBox{
.el-table th .cell{
color:rgba(0,0,0,0.5)!important;
}
.el-table td .cell{
color:rgba(0,0,0,1.8)!important;
}

}

</style>

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1.不是scoped
2.每个页面加一个唯一id标识，

                                </div>
            <link href="https://csdnimg.cn/release/phoenix/mdeditor/markdown_views-e44c3c0e64.css" rel="stylesheet">
                </div>