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replace() 方法用於在字串中用一些字元替換另一些字元，或替換一個與Regex匹配的子串。
replace()方法有兩個參數，第一個參數是Regex，Regex如果帶全域標誌/g，則是代表替換所有匹配的字串，否則是只替換第一個匹配串。
第二個參數可以是字串，也可以是函數。$1、$2...表示與Regex匹配的文本。
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原始碼如下：
1 <!DOCTYPE html> 2 <html> 3 <head> 4 <meta http-equiv="Content-Type" Content="text/html; charset=utf-8;"> 5 <title> JS replace方法 </title> 6 <meta name="author" content="rainna" /> 7 <meta name="keywords" content="rainna‘s js lib" /> 8 <meta name="description" content="JS replace方法" /> 9 </head>10 <body>11 <h1>使用JS的replace()方法把所有單詞的首字母大寫</h1>12 <p>replace() 方法用於在字串中用一些字元替換另一些字元，或替換一個與Regex匹配的子串。<br />replace()方法有兩個參數，第一個參數是Regex，Regex如果帶全域標誌/g，則是代表替換所有匹配的字串，否則是只替換第一個匹配串。<br />13 第二個參數可以是字串，也可以是函數。$1、$2...表示與Regex匹配的文本。</p>14 <p id="word">There are many ways we can make a difference. Global change starts with you. Sign up for our free newsletter today.</p>15 <a href="" id="replaceBtn">替換</a>16 17 <script>18 var replaceFunc = function(){19 var word = document.getElementById(‘word‘).innerText.toString(),20 btn = document.getElementById(‘replaceBtn‘);21 22 var func1 = function(str){23 return str.replace(/\b\w+\b/g,function(word){24 return word.substring(0,1).toUpperCase() + word.substring(1);25 });26 }27 28 btn.onclick = function(event){29 event.preventDefault();30 console.log(func1(word));31 } 32 }33 34 replaceFunc();35 </script>36 </body>37 </html>
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