如果数据或图的标题坐标轴等参数含有中文，在网页中显示就会出现警告，虽然图画出来都是正常
例如：
<br />
b = c(1000, 1300, 1600, 1800, 2100, 2400, 2700, 3000)<br />
h = hist(x$X, breaks = b, xlab = "salary", freq = F, main = "工人工资直方图")<br />
## Warning: 'mbcsToSbcs'里转换'宸ヤ汉宸ヨ祫鐩存柟鍥戼<U+3E65>'出错：<e5>代替了dot<br />
## Warning: 'mbcsToSbcs'里转换'宸ヤ汉宸ヨ祫鐩存柟鍥戼<U+3E65>'出错：<b7>代替了dot<br />
## Warning: 'mbcsToSbcs'里转换'宸ヤ汉宸ヨ祫鐩存柟鍥戼<U+3E65>'出错：<a5>代替了dot<br />
## Warning: 'mbcsToSbcs'里转换'宸ヤ汉宸ヨ祫鐩存柟鍥戼<U+3E65>'出错：<e4>代替了dot<br />
## Warning: 'mbcsToSbcs'里转换'宸ヤ汉宸ヨ祫鐩存柟鍥戼<U+3E65>'出错：<ba>代替了dot<br />
## Warning: 'mbcsToSbcs'里转换'宸ヤ汉宸ヨ祫鐩存柟鍥戼<U+3E65>'出错：<ba>代替了dot<br />
## Warning: 'mbcsToSbcs'里转换'宸ヤ汉宸ヨ祫鐩存柟鍥戼<U+3E65>'出错：<e5>代替了dot<br />
## Warning: 'mbcsToSbcs'里转换'宸ヤ汉宸ヨ祫鐩存柟鍥戼<U+3E65>'出错：<b7>代替了dot<br />
## Warning: 'mbcsToSbcs'里转换'宸ヤ汉宸ヨ祫鐩存柟鍥戼<U+3E65>'出错：<a5>代替了dot<br />
## Warning: 'mbcsToSbcs'里转换'宸ヤ汉宸ヨ祫鐩存柟鍥戼<U+3E65>'出错：<e8>代替了dot<br />
## Warning: 'mbcsToSbcs'里转换'宸ヤ汉宸ヨ祫鐩存柟鍥戼<U+3E65>'出错：<b5>代替了dot<br />
## Warning: 'mbcsToSbcs'里转换'宸ヤ汉宸ヨ祫鐩存柟鍥戼<U+3E65>'出错：<84>代替了dot<br />
## Warning: 'mbcsToSbcs'里转换'宸ヤ汉宸ヨ祫鐩存柟鍥戼<U+3E65>'出错：<e7>代替了dot<br />
## Warning: 'mbcsToSbcs'里转换'宸ヤ汉宸ヨ祫鐩存柟鍥戼<U+3E65>'出错：<9b>代替了dot<br />
## Warning: 'mbcsToSbcs'里转换'宸ヤ汉宸ヨ祫鐩存柟鍥戼<U+3E65>'出错：<b4>代替了dot<br />
## Warning: 'mbcsToSbcs'里转换'宸ヤ汉宸ヨ祫鐩存柟鍥戼<U+3E65>'出错：<e6>代替了dot<br />
## Warning: 'mbcsToSbcs'里转换'宸ヤ汉宸ヨ祫鐩存柟鍥戼<U+3E65>'出错：<96>代替了dot<br />
## Warning: 'mbcsToSbcs'里转换'宸ヤ汉宸ヨ祫鐩存柟鍥戼<U+3E65>'出错：<b9>代替了dot<br />
## Warning: 'mbcsToSbcs'里转换'宸ヤ汉宸ヨ祫鐩存柟鍥戼<U+3E65>'出错：<e5>代替了dot<br />
## Warning: 'mbcsToSbcs'里转换'宸ヤ汉宸ヨ祫鐩存柟鍥戼<U+3E65>'出错：<9b>代替了dot<br />
## Warning: 'mbcsToSbcs'里转换'宸ヤ汉宸ヨ祫鐩存柟鍥戼<U+3E65>'出错：<be>代替了dot<br />
</p>
出现了一堆## Warning，如果标题改为英文就不会出现，求助各位大神该怎么设置才不会出现上面的现象？？
