javascript 在Javascript中将数字连接为字符串
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Concatenating numbers as string in Javascript
提问by Saturnix
myCoolObject {
a: 0
b: 12
c: 24
}
I want to concatenate a, band cso that they look like a unique string "a-b-c" (or "0-12-24" in the example).
我想连接a，b并c让他们看起来像一个唯一的字符串“ABC”（或如“0-12-24”）。
a, band cwill always represent numbers. Converting each one of them from int to string require a lot of code: I'd just use sprintf()if I were in PHP or C, but how can I do this in JS without using toString()for each parameter and writing too much code?
a,b并且c总是代表数字。将它们中的每一个从 int 转换为 string 需要大量代码：sprintf()如果我在 PHP 或 C 中，我只会使用，但是如何在 JS 中执行此操作而不使用toString()每个参数并编写太多代码？
Whole code:
全码：
var pickedDate = this.getSelectedDay().year.toString() + "-" + this.getSelectedDay().month.toString() + this.getSelectedDay().day.toString();
Seriously? Isn't there any more efficient way of doing this in js?
严重地？在 js 中没有更有效的方法吗？
回答by rink.attendant.6
var myCoolString = myCoolObject.a + '-' + myCoolObject.b + '-' + myCoolObject.c;
EDIT:
编辑：
With ES6, you can use template stringsto interpolate numbers into strings:
使用 ES6，您可以使用模板字符串将数字插入到字符串中：
let myCoolString = `${myCoolObject.a}-${myCoolObject.b}-${myCoolObject.c}`;
Try it:
试试看：
var myCoolObject = {
a: 0,
b: 12,
c: 24
};
var myCoolString = myCoolObject.a + '-' + myCoolObject.b + '-' + myCoolObject.c;
console.log(typeof myCoolString);
console.log(myCoolString);回答by Paul S.
how can I do this in JS without [...] writing too much code?
我怎样才能在 JS 中做到这一点而不 [...] 编写太多代码？
If you know all of your numbers are positive, you can write even less code to achieve the same as we know JavaScriptexecutes left-to-right.
如果您知道所有数字都是正数，那么您可以编写更少的代码来实现我们所知道的JavaScript从左到右执行的相同效果。
var obj = {a: 0, b: 12, c: 24}; /* define object
String + Number = String
String + Number = String
String + Number = String
String + Number + Number + Number = String */
'' + obj.a + -obj.b + -obj.c; // = "0-12-24"
The -were inserted because String + -Number = "String-Number", e.g.
将-插入，因为String + -Number = "String-Number"，如
'AK' + -47 // "AK-47"
回答by georg
This is mostly done with Array.join:
这主要是通过以下方式完成的Array.join：
var pickedDate = [
this.getSelectedDay().year,
this.getSelectedDay().month,
this.getSelectedDay().day
].join("-")
Although I personally prefer a small utility function similar to pythonic format():
虽然我个人更喜欢类似于 pythonic 的小实用函数format()：
format = function(fmt /*, args */) {
var args = [].slice.call(arguments, 1);
return fmt.replace(/{(\d+)}/g, function(var pickedDate = format('{0}-{1}-{2}',
this.getSelectedDay().year,
this.getSelectedDay().month,
this.getSelectedDay().day)
, ) {
return String(args[])
})
}
and then:
接着：
myObj = {
a: 0,
b: 12,
c: 24
};
var r="";
// iterate through all object properties
for (var p in myObj)
{
//concatenate it
r+=myObj[p]+"-";
}
//remove the last dash
r=r.substring(0,r.length-1);
alert(r.substring(0,r.length-1));
回答by Nikola Mitev
Without much code it looks perfect here is the demo
没有太多代码它看起来很完美这里是演示
if (!String.prototype.format) {
String.prototype.format = function() {
var args = arguments;
return this.replace(/{(\d+)}/g, function(match, number) {
return typeof args[number] != 'undefined'
? args[number]
: match
;
});
};
}
"{0} - {1} - {2}".format(myCoolObject.a, myCoolObject.b,myCoolObject.c)
回答by Igor S.
Try sprintf()for JavaScript.
Add new method to string
if (!String.prototype.format) { String.prototype.format = function() { var args = arguments; return this.replace(/{(\d+)}/g, function(match, number) { return typeof args[number] != 'undefined' ? args[number] : match ; }); }; } "{0} - {1} - {2}".format(myCoolObject.a, myCoolObject.b,myCoolObject.c)
为 JavaScript尝试sprintf()。
向字符串添加新方法
##代码##
