{"id":2667,"date":"2023-11-14T14:26:31","date_gmt":"2023-11-14T06:26:31","guid":{"rendered":""},"modified":"2023-11-14T14:26:31","modified_gmt":"2023-11-14T06:26:31","slug":"JavaScript String","status":"publish","type":"post","link":"https:\/\/bianchenghao6.com\/2667.html","title":{"rendered":"JavaScript String"},"content":{"rendered":"
\n

JavaScript String <\/h1>\n<\/div>\n
\n JavaScript String<\/strong>\u662f\u4e00\u4e2a\u4ee3\u8868\u5b57\u7b26\u5e8f\u5217\u7684\u5bf9\u8c61\u3002\n<\/div>\n
\n \u6709\u4e24\u79cd\u521b\u5efa\u65b9\u6cd5JavaScript\u4e2d\u7684\u5b57\u7b26\u4e32\n<\/div>\n

\u6309\u5b57\u7b26\u4e32\u5b57\u9762\u503c<\/span>
\n\u6309\u5b57\u7b26\u4e32\u5bf9\u8c61(\u4f7f\u7528\u65b0\u5173\u952e\u5b57)<\/span> <\/p>\n

1)\u901a\u8fc7\u5b57\u7b26\u4e32\u5b57\u9762\u503c<\/h2>\n
\n \u4f7f\u7528\u53cc\u5f15\u53f7\u521b\u5efa\u5b57\u7b26\u4e32\u6587\u5b57\u3002\u4f7f\u7528\u5b57\u7b26\u4e32\u6587\u5b57\u521b\u5efa\u5b57\u7b26\u4e32\u7684\u8bed\u6cd5\u5982\u4e0b\uff1a\n<\/div>\n
\n
 var stringname=\"string value\";
 <\/span><\/code><\/pre>\n<\/div>\n
\n  \u8ba9\u6211\u4eec\u770b\u4e00\u4e0b\u521b\u5efa\u5b57\u7b26\u4e32\u6587\u5b57\u7684\u7b80\u5355\u793a\u4f8b\u3002\n<\/div>\n
\n
 <script>
 var str=\"\u8fd9\u662f\u5b57\u7b26\u4e32\u5b57\u9762\u503c\";
 document.write<\/span>(str);
 <\/script>
 <\/span><\/code><\/pre>\n<\/div>\n
\n \u8f93\u51fa\uff1a<\/strong>\n<\/div>\n
\n  \u8fd9\u662f\u5b57\u7b26\u4e32\u5b57\u9762\u503c\n<\/div>\n
 2)\u901a\u8fc7\u5b57\u7b26\u4e32\u5bf9\u8c61(\u4f7f\u7528\u65b0\u5173\u952e\u5b57)<\/h2>\n
\n  \u4f7f\u7528new\u5173\u952e\u5b57\u521b\u5efa\u5b57\u7b26\u4e32\u5bf9\u8c61\u7684\u8bed\u6cd5\u5982\u4e0b\uff1a\n<\/div>\n
\n
 var stringname=new String(\"string literal\");
 <\/span><\/code><\/pre>\n<\/div>\n
\n  \u5728\u8fd9\u91cc\uff0c
\n  new\u5173\u952e\u5b57<\/strong>\u7528\u4e8e\u521b\u5efa\u5b57\u7b26\u4e32\u7684\u5b9e\u4f8b\u3002\n<\/div>\n
\n  \u8ba9\u6211\u4eec\u770b\u770b\u7528new\u5173\u952e\u5b57\u5728JavaScript\u4e2d\u521b\u5efa\u5b57\u7b26\u4e32\u7684\u793a\u4f8b\u3002\n<\/div>\n
\n
 <script>
 var stringname=new String(\"\u4f60\u597dJavaScript\u5b57\u7b26\u4e32\");
 document.write<\/span>(stringname);
 <\/script>
 <\/span><\/code><\/pre>\n<\/div>\n
\n \u8f93\u51fa\uff1a<\/strong>\n<\/div>\n
\n  \u4f60\u597dJavaScript\u5b57\u7b26\u4e32\n<\/div>\n
 JavaScript\u5b57\u7b26\u4e32\u65b9\u6cd5<\/h2>\n
\n  \u8ba9\u6211\u4eec\u770b\u4e00\u4e0b\u5e26\u6709\u793a\u4f8b\u7684JavaScript\u5b57\u7b26\u4e32\u65b9\u6cd5\u5217\u8868\u3002\n<\/div>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u65b9\u6cd5<\/td>\n\u8bf4\u660e<\/td>\n<\/tr>\n
 charAt() <\/td>\n\u5b83\u63d0\u4f9b\u6307\u5b9a\u7d22\u5f15\u5904\u7684char\u503c\u3002<\/td>\n<\/tr>\n
 charCodeAt() <\/td>\n\u5b83\u63d0\u4f9b\u6307\u5b9a\u7d22\u5f15\u5904\u5b58\u5728\u7684\u5b57\u7b26\u7684Unicode\u503c\u3002<\/td>\n<\/tr>\n
 concat() <\/td>\n\u5b83\u63d0\u4f9b\u4e24\u4e2a\u6216\u591a\u4e2a\u5b57\u7b26\u4e32\u7684\u7ec4\u5408\u3002<\/td>\n<\/tr>\n
 indexOf() <\/td>\n\u5b83\u63d0\u4f9b\u7ed9\u5b9a\u5b57\u7b26\u4e32\u4e2d\u5b58\u5728\u7684char\u503c\u7684\u4f4d\u7f6e\u3002<\/td>\n<\/tr>\n
 lastIndexOf() <\/td>\n\u5b83\u901a\u8fc7\u4ece\u6700\u540e\u4e00\u4e2a\u4f4d\u7f6e\u641c\u7d22\u5b57\u7b26\u6765\u63d0\u4f9b\u7ed9\u5b9a\u5b57\u7b26\u4e32\u4e2d\u5b58\u5728\u7684char\u503c\u7684\u4f4d\u7f6e\u3002<\/td>\n<\/tr>\n
 search() <\/td>\n\u5b83\u5c06\u5728\u7ed9\u5b9a\u7684\u5b57\u7b26\u4e32\u4e2d\u641c\u7d22\u6307\u5b9a\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\uff0c\u5982\u679c\u5339\u914d\u5219\u8fd4\u56de\u5176\u4f4d\u7f6e\u3002<\/td>\n<\/tr>\n
 match() <\/td>\n\u5b83\u5c06\u5728\u7ed9\u5b9a\u7684\u5b57\u7b26\u4e32\u4e2d\u641c\u7d22\u6307\u5b9a\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\uff0c\u5982\u679c\u5339\u914d\u5219\u8fd4\u56de\u8be5\u6b63\u5219\u8868\u8fbe\u5f0f\u3002<\/td>\n<\/tr>\n
 replace() <\/td>\n\u5b83\u5c06\u6307\u5b9a\u7684\u5b57\u7b26\u4e32\u66ff\u6362\u4e3a\u6307\u5b9a\u7684\u5b57\u7b26\u4e32\u3002<\/td>\n<\/tr>\n
 substr() <\/td>\n\u5b83\u7528\u4e8e\u6839\u636e\u6307\u5b9a\u7684\u8d77\u59cb\u4f4d\u7f6e\u548c\u957f\u5ea6\u6765\u83b7\u53d6\u7ed9\u5b9a\u5b57\u7b26\u4e32\u7684\u4e00\u90e8\u5206\u3002<\/td>\n<\/tr>\n
 substring() <\/td>\n\u7528\u4e8e\u6839\u636e\u6307\u5b9a\u7684\u7d22\u5f15\u83b7\u53d6\u7ed9\u5b9a\u5b57\u7b26\u4e32\u7684\u4e00\u90e8\u5206\u3002<\/td>\n<\/tr>\n
 slice() <\/td>\n\u7528\u4e8e\u83b7\u53d6\u7ed9\u5b9a\u5b57\u7b26\u4e32\u7684\u4e00\u90e8\u5206\u3002\u5b83\u5141\u8bb8\u6211\u4eec\u5206\u914d\u6b63\u8d1f\u7d22\u5f15\u3002<\/td>\n<\/tr>\n
 toLowerCase() <\/td>\n\u5b83\u5c06\u7ed9\u5b9a\u7684\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5c0f\u5199\u5b57\u6bcd\u3002<\/td>\n<\/tr>\n
 toLocaleLowerCase() <\/td>\n\u5b83\u5c06\u6839\u636e\u4e3b\u673a\u7684\u5f53\u524d\u8bed\u8a00\u73af\u5883\u5c06\u7ed9\u5b9a\u7684\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5c0f\u5199\u5b57\u6bcd\u3002<\/td>\n<\/tr>\n
 toUpperCase() <\/td>\n\u5b83\u5c06\u7ed9\u5b9a\u7684\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5927\u5199\u5b57\u6bcd\u3002<\/td>\n<\/tr>\n
 toLocaleUpperCase() <\/td>\n\u5b83\u5c06\u6839\u636e\u4e3b\u673a\u7684\u5f53\u524d\u8bed\u8a00\u73af\u5883\u5c06\u7ed9\u5b9a\u7684\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5927\u5199\u5b57\u6bcd\u3002<\/td>\n<\/tr>\n
 toString() <\/td>\n\u5b83\u63d0\u4f9b\u4e86\u4ee3\u8868\u7279\u5b9a\u5bf9\u8c61\u7684\u5b57\u7b26\u4e32\u3002<\/td>\n<\/tr>\n
 valueOf() <\/td>\n\u5b83\u63d0\u4f9b\u5b57\u7b26\u4e32\u5bf9\u8c61\u7684\u539f\u59cb\u503c\u3002<\/td>\n<\/tr>\n
split()<\/td>\n\u5b83\u5c06\u5b57\u7b26\u4e32\u62c6\u5206\u4e3a\u5b50\u5b57\u7b26\u4e32\u6570\u7ec4\uff0c\u7136\u540e\u8fd4\u56de\u8be5\u65b0\u521b\u5efa\u7684\u6570\u7ec4\u3002<\/td>\n<\/tr>\n
trim()<\/td>\n\u5b83\u4ece\u5b57\u7b26\u4e32\u7684\u5de6\u4fa7\u548c\u53f3\u4fa7\u4fee\u526a\u7a7a\u767d\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
 1)JavaScript String charAt(index)\u65b9\u6cd5<\/h2>\n
\n  JavaScript String charAt()\u65b9\u6cd5\u8fd4\u56de\u7ed9\u5b9a\u7d22\u5f15\u5904\u7684\u5b57\u7b26\u3002\n<\/div>\n
\n
 <script>
 var str=\"javascript\";
 document.write<\/span>(str.charAt<\/span>(2));
 <\/script>
 <\/span><\/code><\/pre>\n<\/div>\n
\n \u8f93\u51fa\uff1a<\/strong>\n<\/div>\n
\n  v\n<\/div>\n
 2)JavaScript String concat(str)\u65b9\u6cd5<\/h2>\n
\n  JavaScript String concat(str)\u65b9\u6cd5\u8fde\u63a5\u6216\u8fde\u63a5\u4e24\u4e2a\u5b57\u7b26\u4e32\u3002\n<\/div>\n
\n
 <script>
 var s1=\"javascript \";
 var s2=\"concat \u793a\u4f8b\";
 var s3=s1.concat<\/span>(s2);
 document.write<\/span>(s3);
 <\/script>
 <\/span><\/code><\/pre>\n<\/div>\n
\n \u8f93\u51fa\uff1a<\/strong>\n<\/div>\n
\n  javascript concat \u793a\u4f8b\n<\/div>\n
 3)JavaScript String indexOf(str)\u65b9\u6cd5<\/h2>\n
\n  JavaScript String indexOf(str)\u65b9\u6cd5\u8fd4\u56de\u7ed9\u5b9a\u5b57\u7b26\u4e32\u7684\u7d22\u5f15\u4f4d\u7f6e\u3002\n<\/div>\n
\n
 <script>
 var s1=\"javascript from lidihuo indexof\";
 var n=s1.indexOf<\/span>(\"from\");
 document.write<\/span>(n);
 <\/script>
 <\/span><\/code><\/pre>\n<\/div>\n
\n \u8f93\u51fa\uff1a<\/strong>\n<\/div>\n
\n  11\n<\/div>\n
 4)JavaScript String lastIndexOf(str)\u65b9\u6cd5<\/h2>\n
\n  JavaScript String lastIndexOf(str)\u65b9\u6cd5\u8fd4\u56de\u7ed9\u5b9a\u5b57\u7b26\u4e32\u7684\u6700\u540e\u4e00\u4e2a\u7d22\u5f15\u4f4d\u7f6e\u3002\n<\/div>\n
\n
 <script>
 var s1=\"javascript from lidihuo indexof\";
 var n=s1.lastIndexOf<\/span>(\"java\");
 document.write<\/span>(n);
 <\/script>
 <\/span><\/code><\/pre>\n<\/div>\n
\n \u8f93\u51fa\uff1a<\/strong>\n<\/div>\n
\n  16\n<\/div>\n
 5)JavaScript String toLowerCase()\u65b9\u6cd5<\/h2>\n
\n  JavaScript String toLowerCase()\u65b9\u6cd5\u4ee5\u5c0f\u5199\u5b57\u6bcd\u8fd4\u56de\u7ed9\u5b9a\u7684\u5b57\u7b26\u4e32\u3002\n<\/div>\n
\n
 <script>
 var s1=\"JavaScript toLowerCase \u793a\u4f8b\";
 var s2=s1.toLowerCase<\/span>();
 document.write<\/span>(s2);
 <\/script>
 <\/span><\/code><\/pre>\n<\/div>\n
\n \u8f93\u51fa\uff1a<\/strong>\n<\/div>\n
\n  javascript tolowercase \u793a\u4f8b\n<\/div>\n
 6)JavaScript String toUpperCase()\u65b9\u6cd5<\/h2>\n
\n  JavaScript String toUpperCase()\u65b9\u6cd5\u4ee5\u5927\u5199\u5b57\u6bcd\u8fd4\u56de\u7ed9\u5b9a\u7684\u5b57\u7b26\u4e32\u3002\n<\/div>\n
\n
 <script>
 var s1=\"JavaScript \u5927\u5199\u793a\u4f8b\";
 var s2=s1.toUpperCase<\/span>();
 document.write<\/span>(s2);
 <\/script>
 <\/span><\/code><\/pre>\n<\/div>\n
\n \u8f93\u51fa\uff1a<\/strong>\n<\/div>\n
\n  JAVASCRIPT \u5927\u5199\u793a\u4f8b\n<\/div>\n
 7)JavaScript\u5b57\u7b26\u4e32slice(beginIndex\uff0cendIndex)\u65b9\u6cd5<\/h2>\n
\n  JavaScript\u5b57\u7b26\u4e32slice(beginIndex\uff0cendIndex)\u65b9\u6cd5\u4ece\u7ed9\u5b9a\u7684beginIndex\u5230endIndex\u8fd4\u56de\u5b57\u7b26\u4e32\u7684\u5404\u4e2a\u90e8\u5206\u3002\u5728slice()\u65b9\u6cd5\u4e2d\uff0cbeginIndex\u662f\u5305\u542b\u7684\uff0cendIndex\u662f\u6392\u9664\u7684\u3002\n<\/div>\n
\n
 <script>
 var s1=\"abcdefgh\";
 var s2=s1.slice<\/span>(2,5);
 document.write<\/span>(s2);
 <\/script>
 <\/span><\/code><\/pre>\n<\/div>\n
\n \u8f93\u51fa\uff1a<\/strong>\n<\/div>\n
\n  cde\n<\/div>\n
 8)JavaScript String trim()\u65b9\u6cd5<\/h2>\n
\n  JavaScript String trim()\u65b9\u6cd5\u4ece\u5b57\u7b26\u4e32\u4e2d\u5220\u9664\u524d\u5bfc\u548c\u5c3e\u968f\u7a7a\u683c\u3002\n<\/div>\n
\n
 <script>
 var s1=\" javascript trim \";
 var s2=s1.trim<\/span>();
 document.write<\/span>(s2);
 <\/script>
 <\/span><\/code><\/pre>\n<\/div>\n
\n \u8f93\u51fa\uff1a<\/strong>\n<\/div>\n
\n  javascript trim\n<\/div>\n
 9)JavaScript\u5b57\u7b26\u4e32split()\u65b9\u6cd5<\/h3>\n
\n
 <script>
 var str=\"This is lidihuo website\";
 document.write<\/span>(str.split<\/span>(\" \")); \/\/ splits\u5206\u5272\u5b57\u7b26\u4e32
 <\/script>
 <\/span><\/code><\/pre>\n<\/div>\n
\n \u8f93\u51fa\uff1a<\/strong>\n<\/div>\n
\n