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var normal_monkey = "I am a monkey!<br>";
document.writeln("Normal monkey " + normal_monkey);
var bold_monkey = normal_monkey.bold();
document.writeln("Bold monkey " + bold_monkey);
ÕâÀïµÄÉùÃ÷£º var bold_monkey = normal_monkey.bold();
ºÍÏÂÃæ¶ÔÉùÃ÷ÊǵÈͬµÄ£º 
var bold_monkey = "<b>" + normal_monkey + "</b>";
µÚ1¸ö°æ±¾µÄÉùÃ÷¿´ÆðÀ´Òª¼òÃ÷µÃ¶à¡£ÕâÀïÓõ½ÁË×Ö·û´®¶ÔÏóÖÐ
µÄbold¶ÔÏó£¬ÆäËûµÄ×Ö·û´®¶ÔÏó»¹ÓÐindexOf, charAt, 
substring, ÒÔ¼°split, ÕâЩ·½·¨¿ÉÒÔÉîÈë×Ö·û´®µÄ×é³É½á¹¹¡£
Ê×ÏÈÎÒÃÇÑо¿Ò»ÏÂindexOf¡£
2¡¢indexOf
indexOfÓÃÓÚ·¢ÏÖһϵÁеÄ×Ö·ûÔÚÒ»¸ö×Ö·û´®ÖеÈλÖò¢¸æËßÄã×Ó×Ö·û´®µÄÆðʼλÖá£Èç
¹ûÒ»¸ö×Ö·û´®Öв¿°üº¬¸Ã×Ó×Ö·û´®ÔòindexOf·µ»Øreturns "-1."
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var the_word = "monkey"; 
 //ÈÃÎÒÃÇ´Óµ¥´Ê "monkey"¿ªÊ¼¡£ 
var location_of_m = the_word.indexOf("m"); 
 //location_of_m(×ÖĸmµÄλÖÃ)½«Îª0£¬ÒòΪ×ÖĸmλÓÚ¸Ã×Ö·û´®µÄÆðʼλÖá£
var location_of_o = the_word.indexOf("o"); 
 //location_of_o(×ÖĸoµÄλÖÃ)½«Îª1¡£
var location_of_key = the_word.indexOf("key"); 
 //location_of_key(keyµÄλÖÃ)½«Îª3ÒòΪ×Ó×Ö·û´®“key”ÒÔ×Öĸk¿ªÊ¼£¬¶øk
ÔÚµ¥´ÊmonkeyÖеÄλÖÃÊÇ3¡£
var location_of_y = the_word.indexOf("y"); 
 //location_of_y)×ÖĸyµÄλÖÃ)ÊÇ5¡£ 
var cheeky = the_word.indexOf("q"); 
 //cheekyÖµÊÇ-1£¬ÒòΪÔÚµ¥´Ê“monk


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