虽然赛季末已经过去了，但我一直在看给出的答案，并得到了我的两便士:

用法:

var one = strFormat('"{0}" is not {1}', 'aalert', 'defined');
var two = strFormat('{0} {0} {1} {2}', 3.14, 'a{2}bc', 'foo');

方法:

function strFormat() {
    var args = Array.prototype.slice.call(arguments, 1);
    return arguments[0].replace(/\{(\d+)\}/g, function (match, index) {
        return args[index];
    });
}

结果:

"aalert" is not defined
3.14 3.14 a{2}bc foo

在上面adamJLev的精彩回答的基础上，下面是TypeScript版本:

// Extending String prototype
interface String {
    format(...params: any[]): string;
}

// Variable number of params, mimicking C# params keyword
// params type is set to any so consumer can pass number
// or string, might be a better way to constraint types to
// string and number only using generic?
String.prototype.format = function (...params: any[]) {
    var s = this,
        i = params.length;

    while (i--) {
        s = s.replace(new RegExp('\\{' + i + '\\}', 'gm'), params[i]);
    }

    return s;
};

使用支持EcmaScript 2015 (ES6)的现代浏览器，您可以享受模板字符串。而不是格式化，你可以直接注入变量值:

var name = "Waleed";
var message = `Hello ${name}!`;

注意模板字符串必须使用反勾号(')来编写。

创建了一个以集合或数组作为参数的格式函数

用法:

format("i can speak {language} since i was {age}",{language:'javascript',age:10});

format("i can speak {0} since i was {1}",'javascript',10});

代码:

var format = function (str, col) {
    col = typeof col === 'object' ? col : Array.prototype.slice.call(arguments, 1);

    return str.replace(/\{\{|\}\}|\{(\w+)\}/g, function (m, n) {
        if (m == "{{") { return "{"; }
        if (m == "}}") { return "}"; }
        return col[n];
    });
};

虽然赛季末已经过去了，但我一直在看给出的答案，并得到了我的两便士:

用法:

var one = strFormat('"{0}" is not {1}', 'aalert', 'defined');
var two = strFormat('{0} {0} {1} {2}', 3.14, 'a{2}bc', 'foo');

方法:

function strFormat() {
    var args = Array.prototype.slice.call(arguments, 1);
    return arguments[0].replace(/\{(\d+)\}/g, function (match, index) {
        return args[index];
    });
}

结果:

"aalert" is not defined
3.14 3.14 a{2}bc foo

我无法让乔希·斯托多拉的答案奏效，但下面的答案对我很管用。注意样机的规格。(在IE, FF, Chrome和Safari上测试):

String.prototype.format = function() {
    var s = this;
    if(t.length - 1 != args.length){
        alert("String.format(): Incorrect number of arguments");
    }
    for (var i = 0; i < arguments.length; i++) {       
        var reg = new RegExp("\\{" + i + "\\}", "gm");
        s = s.replace(reg, arguments[i]);
    }
    return s;
}

S应该是这个的克隆，这样就不会是破坏性的方法，但其实没必要。