JavaScript之replace方法的使用说明
replace方法用于字符串中的某些字符替换为其他字符,或替换与正则表达式匹配的子字符串,下面是JavaScript之replace方法的使用说明,跟着爱站技术频道小编带你来了解一下吧!
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.
而str.replace(/\-/g,"!")则可以替换掉全部匹配的字符(g为全局标志)。
replace()
The replace() method returns the string that results when you replace text matching its first argument
(a regular expression) with the text of the second argument (a string).
If the g (global) flag is not set in the regular expression declaration, this method replaces only the first
occurrence of the pattern. For example,
var s = "Hello. Regexps are fun.";s = s.replace(/\./, "!"); // replace first period with an exclamation pointalert(s);
produces the string “Hello! Regexps are fun.” Including the g flag will cause the interpreter to
perform a global replace, finding and replacing every matching substring. For example,
var s = "Hello. Regexps are fun.";s = s.replace(/\./g, "!"); // replace all periods with exclamation pointsalert(s);
yields this result: “Hello! Regexps are fun!”
上面是爱站技术频道为大家整理的JavaScript之replace方法的使用说明,大家了解了多少呢?如大家有任何疑问可以给小编留言,这边会在第一时间为大家解答。