s = 'hello %s, how are you doing' % (my_name)
在python中就是这么做的。如何在javascript/node.js中做到这一点?
s = 'hello %s, how are you doing' % (my_name)
在python中就是这么做的。如何在javascript/node.js中做到这一点?
当前回答
从node.js >4.0开始,它与ES6标准更加兼容,其中字符串操作得到了极大的改进。
原始问题的答案可以很简单:
var s = `hello ${my_name}, how are you doing`;
// note: tilt ` instead of single quote '
字符串可以展开多行,这使得模板或HTML/XML处理非常容易。关于它的更多细节和功能:模板字面量是在mozilla.org上的字符串字面量。
其他回答
var print = console.log;
function dformat(str, ...arr) {
return str.replace(/%(\d+)/g, function(_,i) {
return arr[--i];
});
}
function wformat(str, dict) {
return str.replace(/%(\w+)/g, function(_,k) {
return dict[k];
});
}
function sformat(str, dict) {
return str.replace(/\$(\w+)/g, function(_,m) {
return dict[m];
});
}
function tformat(str, dict) {
return str.replace(/\${(\w+)}/g, function(_,m) {
return dict[m];
});
}
print(1, dformat("uid:%1, name:%2", 120, "someone") )
print(2, wformat("color: %name", {name: "green"}) )
print(3, sformat("img: $url", {url: "#"}) )
print(4, tformat("${left} ${right}", {right:"1000", left: "7fff"}) )
我写了一个函数来精确地解决这个问题。
第一个参数是要参数化的字符串。你应该把你的变量放在这个字符串中,就像这样“%s1, %s2,…”% s12”。
其他参数分别是该字符串的参数。
/***
* @example parameterizedString("my name is %s1 and surname is %s2", "John", "Doe");
* @return "my name is John and surname is Doe"
*
* @firstArgument {String} like "my name is %s1 and surname is %s2"
* @otherArguments {String | Number}
* @returns {String}
*/
const parameterizedString = (...args) => {
const str = args[0];
const params = args.filter((arg, index) => index !== 0);
if (!str) return "";
return str.replace(/%s[0-9]+/g, matchedStr => {
const variableIndex = matchedStr.replace("%s", "") - 1;
return params[variableIndex];
});
}
例子
parameterizedString("my name is %s1 and surname is %s2", "John", "Doe");
// returns "my name is John and surname is Doe"
parameterizedString("this%s1 %s2 %s3", " method", "sooo", "goood");
// returns "this method sooo goood"
如果变量位置在字符串中改变了,这个函数也支持它而不改变函数参数。
parameterizedString("i have %s2 %s1 and %s4 %s3.", "books", 5, "pencils", "6");
// returns "i have 5 books and 6 pencils."
如果你使用的是ES6,你应该使用模板文字。
//you can do this
let sentence = `My name is ${ user.name }. Nice to meet you.`
点击此处阅读更多信息: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals
下面是Node.js中的一个多行字符串文本示例。
> let name = 'Fred'
> tm = `Dear ${name},
... This is to inform you, ${name}, that you are
... IN VIOLATION of Penal Code 64.302-4.
... Surrender yourself IMMEDIATELY!
... THIS MEANS YOU, ${name}!!!
...
... `
'Dear Fred,\nThis is to inform you, Fred, that you are\nIN VIOLATION of Penal Code 64.302-4.\nSurrender yourself IMMEDIATELY!\nTHIS MEANS YOU, Fred!!!\n\n'
console.log(tm)
Dear Fred,
This is to inform you, Fred, that you are
IN VIOLATION of Penal Code 64.302-4.
Surrender yourself IMMEDIATELY!
THIS MEANS YOU, Fred!!!
undefined
>
const格式=(…args) = > args.shift () .replace (/ % ([jsd]) / g, x = > x = = =“% j”?JSON.stringify(args.shift()): const name = 'Csaba' const格式化= format('Hi %s,今天是%s,您的数据是%j',名称,日期(),{数据:{国家:'匈牙利',城市:'布达佩斯'}}) console.log(格式化)