本文介绍了JavaScript中replace()方法的使用。直接使用str.replace('-', '!')只会替换第一个匹配字符，而使用str.replace(/ - /g, '!')（g为全局标志）可替换全部匹配字符。还通过示例展示了有无全局标志时的不同替换效果。
1
第一次发现JavaScript中replace() 方法如果直接用str.replace("-","!") 只会替换第一个匹配的字符.
2而str.replace(//-/g,"!")则可以替换掉全部匹配的字符（g为全局标志）。
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4
5replace()
6The replace() method returns the string that results when you replace text matching its first argument
7(a regular expression) with the text of the second argument (a string).
8If the g (global) flag is not set in the regular expression declaration, this method replaces only the first
9occurrence of the pattern. For example,
10
11var s = "Hello. Regexps are fun.";s = s.replace(//./, "!"); // replace first period with an exclamation pointalert(s);
12
13produces the string “Hello! Regexps are fun.” Including the g flag will cause the interpreter to
14perform a global replace, finding and replacing every matching substring. For example,
15
16var s = "Hello. Regexps are fun.";s = s.replace(//./g, "!"); // replace all periods with exclamation pointsalert(s);
17
18yields this result: “Hello! Regexps are fun!”
第一次发现JavaScript中replace() 方法如果直接用str.replace("-","!") 只会替换第一个匹配的字符. 2
而str.replace(//-/g,"!")则可以替换掉全部匹配的字符（g为全局标志）。3
4
5
replace() 6
The replace() method returns the string that results when you replace text matching its first argument 7
(a regular expression) with the text of the second argument (a string). 8
If the g (global) flag is not set in the regular expression declaration, this method replaces only the first 9
occurrence of the pattern. For example, 10
11
var s = "Hello. Regexps are fun.";s = s.replace(//./, "!"); // replace first period with an exclamation pointalert(s); 12
13
produces the string “Hello! Regexps are fun.” Including the g flag will cause the interpreter to 14
perform a global replace, finding and replacing every matching substring. For example, 15
16
var s = "Hello. Regexps are fun.";s = s.replace(//./g, "!"); // replace all periods with exclamation pointsalert(s); 17
18
yields this result: “Hello! Regexps are fun!” 
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