javascript中的replace函数同时替换多个字符串

[wapysun]

javascript中的replace函数同时替换多个字符串


如果在一句话中要把多个不同的字符串分别替换成不同的字符串怎么替换 比如说“my javascript is very poor,who can help me?" 要在这句话中分别替换 my-->his is-->was can-->could 改怎么做？

[BeenZ]

<script>
    var s="my javascript is very poor,who can help me?"
    var reg=/(\w*)my(.*)is(.*)can(.*)/g

    alert(s.replace(reg,"$1his$2was$3could"));

</script>

[sohighthesky]

应该只能多次替换：

var str="my javascript is very poor,who can help me?"
alert(str.replace(/\bmy\b/i,"his").replace(/\bis\b/i,"was").replace(/\bcan\b/i,"could"));/i，全局匹配，\b匹配空格或起始

[sohighthesky]

[Quote=引用 1 楼 beenz 的回复:]
HTML code<script>var s="my javascript is very poor,who can help me?"var reg=/(\w*)my(.*)is(.*)can(.*)/g

alert(s.replace(reg,"$1his$2was$3could"));</script>
[/Quote]
学习

[sohighthesky]

[Quote=引用 1 楼 beenz 的回复:]
HTML code<script>var s="my javascript is very poor,who can help me?"var reg=/(\w*)my(.*)is(.*)can(.*)/g

alert(s.replace(reg,"$1his$2was$3could"));</script>
[/Quote]
有点问题好像，后面的截断了

[我是个疯子，你是个傻子]

@wcwtitxu 太优秀了

[wcwtitxu]

Array.prototype.each = function(trans) {
	for (var i=0; i<this.length; i++)
		this[i] = trans(this[i], i, this);
	return this;
};
Array.prototype.map = function(trans) {
	return [].concat(this).each(trans);
};
RegExp.escape = function(str) {
	return new String(str).replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1');
};
function properties(obj) {
	var props = [];
	for (var p in obj) props.push(p);
	return props;
}
// ---------------------------------------------




var str = "my javascript is very poor,who can help me?";

var replacements = {
	  "my" : "his"
	, "is" : "was"
	, "can": "could"
};
var regex = new RegExp(properties(replacements).map(RegExp.escape).join("|"), "g");
str = str.replace(regex, function($0) { return replacements[$0]; });


WScript.Echo(str);

[BeenZ]

[Quote=引用 4 楼 sohighthesky 的回复:]
引用 1 楼 beenz 的回复:
HTML code <script>var s="my javascript is very poor,who can help me?"var reg=/(\w*)my(.*)is(.*)can(.*)/g

    alert(s.replace(reg,"$1his$2was$3could")); </script>

有点问题好像，后面的截断了
[/Quote]
是的
少写了个$4...
这样

<script>
    var s="my javascript is very poor,who can help me?"
    var reg=/(\w*)my(.*)is(.*)can(.*)/g

    alert(s.replace(reg,"$1his$2was$3could$4"));

</script>

[王集鹄]

更好的解决方案是这样：

var s="my javascript is very poor,who can help me?"
s = s.replace(/\b(my|is|can)\b/g, function($0, $1) {
    return {
        "my": "his"
        , "is": "was"
        , "can": "could"
    }[$1];
});
alert(s);

考虑出现：
“cancel”不至于替换成“couldcel”
还有单词出现的位置次数未知的情况

[王集鹄]

5楼的代码虽然繁琐，但扩展性比较强，只要定义字典即可。

[wapysun]

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