{"id":4787,"date":"2016-02-18T23:09:58","date_gmt":"2016-02-18T15:09:58","guid":{"rendered":"https:\/\/sdeno.com\/?p=4787"},"modified":"2018-05-27T22:01:25","modified_gmt":"2018-05-27T14:01:25","slug":"js%e4%b8%ad%e6%95%b0%e5%ad%97%e7%b1%bb%e5%9e%8b%e3%80%81%e5%ad%97%e7%ac%a6%e4%b8%b2%e7%b1%bb%e5%9e%8b%e5%90%84%e8%87%aa%e5%b8%a6%e7%9a%84%e5%b1%9e%e6%80%a7%e5%92%8c%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/sdeno.com\/?p=4787","title":{"rendered":"js\u4e2d\u6570\u5b57\u7c7b\u578b\u3001\u5b57\u7b26\u4e32\u7c7b\u578b\u5404\u81ea\u5e26\u7684\u5c5e\u6027\u548c\u65b9\u6cd5"},"content":{"rendered":"

\u6570\u5b57\u7c7b\u578b\u548c\u5b57\u7b26\u4e32\u7c7b\u578btxt\u7b14\u8bb0<\/a><\/p>\n

\u5728JS\u91cc\u8981\u64cd\u4f5c\u6570\u5b57\u7c7b\u578b\u6216\u8005\u5b57\u7b26\u4e32\u7c7b\u578b\u90fd\u9700\u8981\u8c03\u7528js\u5185\u7f6e\u7684\u5c5e\u6027\u6216\u8005\u65b9\u6cd5\uff0c\u800c\u8fd9\u4e9b\u5c5e\u6027\u548c\u65b9\u6cd5\u5c31\u662f\u9488\u5bf9\u6570\u5b57\u7c7b\u578b\u548c\u5b57\u7b26\u4e32\u7c7b\u578b\u7684\u3002<\/p>\n

 <\/p>\n

\u6570\u5b57\u7c7b\u578b\u81ea\u5e26\u65b9\u6cd5<\/strong>
\nvar box=10000.789;
\nbox.toString() \/\/\u5f3a\u5236\u8f6c\u5316\u4e3aString\u7c7b\u578b
\nbox.toLocaleString() \/\/10,000
\nbox.toFixed(2) \/\/ 10000.79 \u4fdd\u75592\u4f4d\u5c0f\u6570\u5e76\u56db\u820d\u4e94\u5165
\n\u8fd8\u6709\u5176\u4ed6\u7684\u5185\u7f6e\u65b9\u6cd5\u4f46\u662f\u4e0d\u5e38\u7528<\/p>\n

 <\/p>\n

 <\/p>\n

\u5b57\u7b26\u4e32\u7c7b\u578b\u81ea\u5e26\u5c5e\u6027\u548c\u65b9\u6cd5<\/strong>
\nvar box = ‘Mr. Lee’;
\nalert(box.length); \/\/\u5b57\u7b26\u4e32\u957f\u5ea6<\/p>\n

\/\/alert(box.charAt(1)); \/\/r
\n\/\/alert(box.charCodeAt(4)); \/\/L\uff0c\u8fd4\u56de\u7684\u662facssii\u7801<\/p>\n

\/\/alert(box.concat(‘ is ‘, ‘ Teacher ‘, ‘!’)); \/\/\u53c2\u6570\u5b57\u7b26\u4e32\u8fde\u63a5<\/p>\n

 <\/p>\n

slice() substring() substr() \u7d22\u5f15\u90fd\u662f\u4ece0\u5f00\u59cb
\n\/\/alert(box.slice(4, 6)); \/\/Le
\n\/\/alert(box.substring(4, 6)); \/\/Le
\n\/\/alert(box.substr(4,6)); \/\/\u4ece\u7b2c\u56db\u4e2a\u5f00\u59cb\uff0c\u90096\u4e2a
\n\/\/alert(box.substr(4,2)); \/\/Le<\/p>\n

 <\/p>\n

\/\/alert(box.slice(4));
\n\/\/alert(box.substring(4));
\n\/\/alert(box.substr(4)); \/\/\u4e09\u4e2a\u90fd\u662fLee<\/p>\n

 <\/p>\n

\/\/alert(box.slice(-2)); \/\/7+(-2)=5, \u7b2c5\u4f4d\u5f00\u59cb\uff0cee
\n\/\/alert(box.substring(-2)); \/\/\u8d1f\u6570\u8fd4\u56de\u5168\u90e8\u5b57\u7b26\u4e32\uff0cMr. Lee
\n\/\/alert(box.substr(-2)); \/\/7+(-2)=5, \u7b2c5\u4f4d\u5f00\u59cb\uff0cee \u4e0d\u63a8\u8350substr\u4f7f\u7528\u8d1f\u6570<\/p>\n

 <\/p>\n

\/\/alert(box.slice(2,-1)); \/\/7+(-1)=6\uff0c(2,6)\uff0c. Le
\n\/\/alert(box.slice(-2,-1)); \/\/7+(-2)=5, 7+(-1)=6\uff0c(5,6)\uff0ce
\n\/\/alert(box.substring(2,-1)); \/\/\u53c2\u6570\u5982\u679c\u662f\u8d1f\uff0c\u76f4\u63a50\uff0c(2,0); \u5982\u679c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u6bd4\u7b2c\u4e00\u4e2a\u5c0f\uff0c\u90a3\u4e48\u7b2c\u4e8c\u4e2a\u53c2\u6570\u63d0\u524d\uff0c(0,2)
\n\/\/alert(box.substr(2, -1)); \/\/\u7b2c\u4e8c\u53c2\u6570\u4e3a\u8d1f\uff0c\u76f4\u63a50\uff0c(2,0)\uff0c\u7a7a \u4e0d\u63a8\u8350substr\u4f7f\u7528\u8d1f\u6570<\/p>\n

 <\/p>\n

var box = ‘Mr. Lee’;
\n\/\/alert(box.toLowerCase()); \/\/\u5168\u90e8\u6362\u6210\u5c0f\u5199
\n\/\/alert(box.toUpperCase()); \/\/\u5168\u90e8\u6362\u6210\u5927\u5199
\nalert(box.toLocaleLowerCase());
\nalert(box.toLocaleUpperCase());<\/p>\n

 <\/p>\n

\/\/var box = ‘Mr. Lee’;
\n\/\/alert(box.match(‘L’)); \/\/\u627e\u5230L\u5373\u8fd4\u56deL
\n\/\/alert(box.match(‘,’)); \/\/\u6ca1\u627e\u5230null
\n\/\/alert(box.search(‘L’)); \/\/\u627e\u5230L\u7684\u4f4d\u7f6e\uff0c\u8ddfindexOf\u4e00\u6837
\n\/\/alert(box.replace(‘L’, ‘Q’)); \/\/L\u6362\u6210Q
\n\/\/alert(box.split(‘ ‘)); \/\/\u5206\u5272\u6210\u6570\u7ec4<\/p>\n

 <\/p>\n

js \u904d\u5386\u3001\u679a\u4e3e<\/a><\/p><\/blockquote>\n