您好，这看起来很简单，但我不明白为什么第一个功能不起作用。我尝试了几种变体，但我的逻辑有问题。当我查看https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/replace时，我似乎已经正确完成了它，但它不会替换文本。在此先感谢您的帮助。<!DOCTYPE html><html> <body> <p id="p1">Mr Red has a red house and a red car.</p> <p id="p2">Mr Red has a red house and a red car.</p> <button onclick="replace1()">Replace red with blue</button> <button onclick="replace2()">Replace red with blue too</button> <script> function replace1() { var str = document.getElementById("p1").innerHTML; str.replace(/red/, "blue"); document.getElementById("p1").innerHTML = str; } function replace2() { var str = document.getElementById("p1").innerHTML; var rep = str.replace(/red/, "blue"); document.getElementById("p2").innerHTML = rep; } </script> </body></html>
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