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JS replace()方法-字符串首字母大写

replace() 方法用于在字符串中用一些字符替换另一些字符,或替换一个与正则表达式匹配的子串。

replace()方法有两个参数,第一个参数是正则表达式,正则表达式如果带全局标志/g,则是代表替换所有匹配的字符串,否则是只替换第一个匹配串。
第二个参数可以是字符串,也可以是函数。$1、$2...表示与正则表达式匹配的文本。

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源代码如下:

 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()方法把所有单词的首字母大写</h1>12 <p>replace() 方法用于在字符串中用一些字符替换另一些字符,或替换一个与正则表达式匹配的子串。<br />replace()方法有两个参数,第一个参数是正则表达式,正则表达式如果带全局标志/g,则是代表替换所有匹配的字符串,否则是只替换第一个匹配串。<br />13 第二个参数可以是字符串,也可以是函数。$1、$2...表示与正则表达式匹配的文本。</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">替换</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>