javascript中的String.Format

发布于 2017-05-28  227 次阅读


String.prototype.format = function(args) {
    var result = this;
    if (arguments.length > 0) {    
        if (arguments.length == 1 && typeof (args) == "object") {
            for (var key in args) {
                if(args[key]!=undefined){
                    var reg = new RegExp("({" + key + "})", "g");
                    result = result.replace(reg, args[key]);
                }
            }
        }
        else {
            for (var i = 0; i < arguments.length; i++) {
                if (arguments[i] != undefined) {
            var reg= new RegExp("({)" + i + "(})", "g");
                    result = result.replace(reg, arguments[i]);
                }
            }
        }
    }
    return result;
}
//两种调用方式
 var template1="我是{0},今年{1}了";
 var template2="我是{name},今年{age}了";
 var result1=template1.format("loogn",22);
 var result2=template2.format({name:"loogn",age:22});
 //两个结果都是"我是loogn,今年22了"

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