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方法一：
function replaceStr(str){ // 正則法 str = str.toLowerCase(); var reg = /\b(\w)|\s(\w)/g; // \b判斷邊界\s判斷空格 return str.replace(reg,function(m){ return m.toUpperCase() });}function replaceStr1(str){ str = str.toLowerCase(); var strTemp = ""; //新字串 for(var i=0;i<str.length;i++){ if(i == 0){ strTemp += str[i].toUpperCase(); //第一個 continue; } if(str[i] == " " && i< str.length-1){ //空格後 strTemp += " "; strTemp += str[i+1].toUpperCase(); i++; continue; } strTemp += str[i]; } return strTemp; } var text = "abcd ABCD efGH";console.log(replaceStr(text));//Abcd Abcd Efghconsole.log(replaceStr1(text));//Abcd Abcd Efgh
方法二：
<script type="text\javascript">function ucfirst(str){var str = str.toLowerCase();var strarr = str.split(' ');var result = '';for(var i in strarr){result += strarr[i].substring(0,1).toUpperCase()+strarr[i].substring(1)+' ';}return result;}</script>
方法三：
<script type="text\javascript">function ucfirst(str) {var str = str.toLowerCase();str = str.replace(/\b\w+\b/g, function(word){ return word.substring(0,1).toUpperCase()+word.substring(1);});return str; </script>
CSS來實現：
<html> <head> <style type="text/css"> h1 {text-transform: uppercase} p.uppercase {text-transform: uppercase} p.lowercase {text-transform: lowercase} p.capitalize {text-transform: capitalize } </style> </head> <body> <h1>This Is An H1 Element</h1> <p class="uppercase">This is a test.</p><p class="lowercase">This is a test.</p><p class="capitalize">This is a test.</p> </body></html>
以上就是給大家總結的4種實現英文首字母大寫的方法，希望大家能夠喜歡。
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