根据搜索/替换对替换字符串中的许多值

Question

如何在JavaScript中替换值替换为数组。

我想完成将数字（例如）替换在一起。怎么样？

1 -replace whit->11
2 -replace whit->22

DEMO：http://jsfiddle.net/ygxfy/

<script type="text/javascript"> 
    var array = {"1":"11", "2":"22"} 
    var str="13332"; 
    document.write(str.replace(array)); 
</script>​ 

Answer 1

你必须创建一个模式，使用正则表达式，然后将其传递给.replace方法。

var array = {"1":"11", "2":"22"}; // <-- Not an array btw. 
// Output. Example: "1133322" 
document.write(special_replace("13332", array)); 

function special_replace(string_input, obj_replace_dictionary) { 
    // Construct a RegEx from the dictionary 
    var pattern = []; 
    for (var name in obj_replace_dictionary) { 
     if (obj_replace_dictionary.hasOwnProperty(name)) { 
      // Escape characters 
      pattern.push(name.replace(/([[^$.|?*+(){}\\])/g, '\\$1')); 
     } 
    } 

    // Concatenate keys, and create a Regular expression: 
    pattern = new RegExp(pattern.join('|'), 'g'); 

    // Call String.replace with a regex, and function argument. 
    return string_input.replace(pattern, function(match) { 
     return obj_replace_dictionary[match]; 
    }); 
} 

Answer 2

<script type="text/javascript"> 
    var rep = {"1":"11", "2":"22"} 
    var str="13332"; 

    for (key in rep) { 
     str = str.split(key).join(rep[key]); 
    } 

    document.write(str); 
</script>​ 

Answer 3

http://jsfiddle.net/mendesjuan/uHUs9/

你可以传递函数为replace方法

RegExp.escape = function(text) { 
    return text.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, "\\$&"); 
} 

String.prototype.mapReplace = function (replacements) { 
    var regex = []; 

    for (var prop in replacements) { 
     regex.push(RegExp.escape(prop)); 
    } 

    regex = new RegExp(regex.join('|'), "g"); 

    return this.replace(regex, function(match){ 
     return map[match]; 
    }); 
} 


var map = {"1":"11", "2":"22"};  
var str="13332"; 

document.write(str.mapReplace(map));​ 

Answer 4

var str = "13332", 
    map = {"1":"11", "2":"22"}; 

str.split("").map(function(num){ 
    return map.hasOwnProperty(num) ? map[num] : num; 
}).join(""); 

//"1133322" 

Answer 5

怎么样使用reduce功能？

<script type="text/javascript"> 
    var array = {"1":"11", "2":"22"}; 
    var str = "13332"; 

    str = Object.keys(array).reduce(function(result, key) { 
    return result.replace(new RegExp(key, 'g'), array[key]); 
    }, str); 

    document.write(str); 
</script>