web前端|js教程
js，字符串
web前端-js教程
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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.
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而str.replace(/\-/g,”!”)则可以全部替换掉匹配的字符(g为全局标志)。
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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!”
所以可以用以下几种方式：
string.replace(/reallyDo/g, replaceWith);
string.replace(new RegExp(reallyDo, ‘g’), replaceWith);
string：字符串表达式包含要替代的子字符串。
reallyDo：被搜索的子字符串。
replaceWith：用于替换的子字符串。
Js代码
String.prototype.replaceAll = function(reallyDo, replaceWith, ignoreCase) { if (!RegExp.prototype.isPrototypeOf(reallyDo)) {return this.replace(new RegExp(reallyDo, (ignoreCase ? "gi": "g")), replaceWith); } else {return this.replace(reallyDo, replaceWith); } }
<!–
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