取出"function"字符串

html页面中有一段文本"function say(){ ... }",我想将里面的"function"字符串用红色字体突出显示出来

温温酱
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精慕HU

最近在做一个编辑器应用,用到了正则,相当于匹配关键字吧:<html><head> &nbsp;&nbsp;&nbsp;&nbsp;<meta&nbsp;charset="utf-8"/> &nbsp;&nbsp;&nbsp;&nbsp;<title>Test</title> &nbsp;&nbsp;&nbsp;&nbsp;<style> &nbsp;&nbsp;&nbsp;&nbsp;.red{&nbsp;color:red;&nbsp;}&nbsp;&nbsp;&nbsp;&nbsp;</style></head><body><p>function&nbsp;say(){...}</p><script> &nbsp;&nbsp;var&nbsp;p&nbsp;=&nbsp;document.getElementsByTagName('p')[0];&nbsp;&nbsp;var&nbsp;txt&nbsp;=&nbsp;p.innerHTML; &nbsp;&nbsp;txt&nbsp;=&nbsp;txt.replace(/function/g,&nbsp;'<span&nbsp;class="red">function</span>'); &nbsp;&nbsp;p.innerHTML&nbsp;=&nbsp;txt;</script></body></html>
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JavaScript