JS 過濾HTML標籤，取得純文本

1、過濾掉全部HTML標籤以下：

str.innerHTML.replace(/<.*?>/g,"")

2、過濾掉帶屬性的某一個標籤，如<span class='aa'></span>標籤：

var str = "<p>這裏是測試過濾<span class='aa'>span標籤的哦</span></p>";
str.replace(/<span (.*?)>/gi,"");

str.replace(/<\/span>/gi,"");

3、過濾掉不帶屬性的某一個標籤，如<span></span>標籤：

var str = "<p>這裏是測試過濾<span>span標籤的哦</span></p>";
str = str.replace(/<span>/gi,"");
str = str.replace(/<\/span>/gi,"");

var str = "<p>這裏是測試過濾<span>span標籤的哦</span></p>";
str.replace(/<span>/gi,"").replace(/<\/span>/gi,"");

4、過濾配對<span></span>標籤（不包含屬性），一塊兒過濾掉

var str = "<p>這裏是測試過濾<span>span標籤的哦</span></p>";
str.replace(/<span>|<\/span>/gi,"");

5、過濾配對<span ></span>標籤（包含屬性），一塊兒過濾掉

var str = "<p>這裏是測試過濾<span>span標籤的哦</span></p>";
str.replace(/<span\s*[^>]*>(.*?)<\/span>/ig,"$1");

var str = "<p>這裏是測試過濾<span>span標籤的哦</span></p>";
str.replace(/<span.*?>|<\/span>/ig,"");

注意事項：

var str = "<p>這裏是測試過濾<span>span標籤的哦</span></p>";
str.replace(/<span>/gi,"");
str.replace(/<\/span>/gi,"");

結果以下：

從結果中能夠看出<span>並無過濾掉，緣由是原字符串不會改變

執行完第一句replace後，能夠看到第二句str仍爲原始值

參考：

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/replace