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<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript 字符串</h1>
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<h2>replace() 方法</h2>
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<p>replace() 方法在字符串中搜索值或正则表达式，并返回已替换值的新字符串。</p>
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<p id="demo">Mr Blue has a blue house and a blue car.</p>
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<script>
let str = document.getElementById("demo").innerHTML; 
let res = str.replace(/blue/g, "red");
document.getElementById("demo").innerHTML = res;
</script>
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</body>
</html>
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