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                我們有時候會在網頁中需要寫小于號(< ),或者在屬性里需要用到引號,比如: ``` 1,要在網頁中寫“a<b”(數學上的a小于b),此時就不能直接寫小于號(想想為什么?); 2,要在網頁中屬性中寫引號(比如:<img src=”xxx.jpg” alt=”英文單引號(‘)和雙引號(“)的異同” >; ``` 此時,就面臨了代碼怎么寫的問題了。 我們此時就只能用“特殊寫法”來表示其中的特殊字符,這就是所謂的字符實體。 常用的字符實體如下所示: ![](https://img.kancloud.cn/88/de/88de873cdc94ea9b4e7bb5584d046b4f_1257x237.png)
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