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）。 3 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!”
