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concat
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var a = "hello";
var b = ",world";
var c = a.concat(b);
alert(c);
//c = "hello,world"
indexOf
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var index1 = a.indexOf("l");
//index1 = 2
var index2 = a.indexOf("l",3);
//index2 = 3
charAt
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var get_char = a.charAt(0);
//get_char = "h"
lastIndexOf
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var index1 = lastIndexOf('l');
//index1 = 3
var index2 = lastIndexOf('l',2)
//index2 = 2
match
¼ì²éÒ»¸ö×Ö·û´®Æ¥ÅäÒ»¸öÕýÔò±í´ïʽÄÚÈÝ£¬Èç¹ûôÓÐÆ¥Åä·µ»Ø null¡£
var re = new RegExp(/^\w+$/);
var is_alpha1 = a.match(re);
//is_alpha1 = "hello"
var is_alpha2 = b.match(re);
//is_alpha2 = null
substring
·µ»Ø×Ö·û´®µÄÒ»¸ö×Ó´®£¬´«Èë²ÎÊýÊÇÆðʼλÖúͽáÊøÎ»Öá£
var sub_string1 = a.substring(1);
//sub_string1 = "ello"
var sub_string2 = a.substring(1,4);
//sub_string2 = "ell"
substr
·µ»Ø×Ö·û´®µÄÒ»¸ö×Ó´®£¬´«Èë²ÎÊýÊÇÆðʼλÖúͳ¤¶È
var sub_string1 = a.substr(1);
//sub_string1 = "ello"
var sub_string2 = a.substr(1,4);
//sub_string2 = "ello"
replace
ÓÃÀ´²éÕÒÆ¥ÅäÒ»¸öÕýÔò±í´ïʽµÄ×Ö·û´®£¬È»ºóʹÓÃÐÂ×Ö·û´®´úÌæÆ¥ÅäµÄ×Ö·û´®¡£
var result1 = a.replace(re,"Hello");
//result1 = "Hello"
var result2 = b.replace(re,"Hello");
//result2 = ",world"
search
Ö´ÐÐÒ»¸öÕýÔò±í´ïʽƥÅä²éÕÒ¡£Èç¹û²éÕҳɹ¦£¬·µ»Ø×Ö·û´®ÖÐÆ¥ÅäµÄË÷ÒýÖµ¡£·ñÔò·µ»Ø -1 ¡£
var index1 = a.search(re);
//index1 = 0
var index2 = b.search(re);
//index2 = -1
slice
ÌáÈ¡×Ö·û´®µÄÒ»²¿·Ö£¬²¢·µ»ØÒ»¸öÐÂ×Ö·û´®£¨Óë substring Ïàͬ£©¡£
var sub_string1 = a.slice(1);
//sub_string1 = "ello"
var sub_string2 = a.slice(1,4);
//sub_string2 = "ell"
split
ͨ¹ý½«×Ö·û´®»®·Ö³É×Ó´®£¬½«Ò»¸ö×Ö·û´®×ö³ÉÒ»¸ö×Ö·û´®Êý×é¡£
var arr1 = a.split("");
//arr1 = [h,e,l,l,o]
length
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var len = a.length();
//len = 5
toLowerCase
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var lower_


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