JS笔记——首字母设置大写

来源：互联网发布：长春市盘古网络法人编辑：程序博客网时间：2024/04/27 14:39
<!DOCTYPE html><!-- 记得可以将id的值作为函数的参数直接传递过去 --><html lang="en"><head><meta charset="UTF-8"><title>首字母大写设置测试</title><script type="text/javascript">function changeCase(frmObj){//tmpChar用于存储大写的字母//postString用于存储后每次处理大写后面的字符串//tmpStr用于存储修改后的字符串var index,tmpStr,tmpChar,preString,postString,strlen;tmpStr = frmObj.value.toLowerCase();strlen = tmpStr.length;if(strlen>0){for(index = 0; index<strlen; index++){if(index == 0){tmpChar = tmpStr.substring(0,1).toUpperCase();postString = tmpStr.substring(1,strlen);tmpStr = tmpChar + postString;}else{tmpChar = tmpStr.substring(index,index+1);if(tmpChar == " " && index<(strlen-1)){tmpChar = tmpStr.substring(index+1,index+2).toUpperCase();//的到空格后第一个字母后变大写preString = tmpStr.substring(0,index+1);//大写字母前面的字符串postString = tmpStr.substring(index+2,strlen);//大写字母后面的字符串tmpStr = preString + tmpChar + postString;}}}}frmObj.value = tmpStr;}</script></head><body><!-- <input type="text" name="txt1" id="txt1" value="i have a lot of thing to do" /> --><textarea id="txt1">i have a lot of thing to do</textarea><input type="button" value="格式化输入" onclick="javascript:changeCase(txt1)" /></body></html>
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