js中的string.format函数代码
String.prototype.format = function(args) { if (arguments.length > 0) { var result = this; if (arguments.length == 1 && typeof (args) == "object") { for (var key in args) { 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) { return ""; } else { var reg = new RegExp("({[" + i + "]})", "g"); result = result.replace(reg, arguments[i]); } } } return result; } else { return this; } }
String.prototype.format = function(args) {
if
(!String.prototype.format) {
String.prototype.format =
function
() {
var
str =
this
.toString();
if
(!arguments.length)
return
str;
var
args =
typeof
arguments[0],
args = ((
"string"
== args ||
"number"
== args) ? arguments : arguments[0]);
for
(arg
in
args)
str = str.replace(RegExp(
"\\{"
+ arg +
"\\}"
,
"gi"
), args[arg]);
return
str;
}
}
}
//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=template1.format({name:"loogn",age:22});
//两个结果都是"我是loogn,今年22了"