[英]JavaScript to replace variable in a string
I want to write a function to replace variables in a string with actual values, for example: 我想编写一个函数来用实际值替换字符串中的变量,例如:
function replaceUrl(url, data) {}
The caller may be: 来电者可能是:
replaceUrl('/task/:module?taskId=:taskId#:hash', {
module: 'm1',
taskId: 't1',
hash: 'h1'
});
I think to use RegEx may be simple to implement this, but I'm not very familiar with it. 我认为使用RegEx可能很容易实现这一点,但我对它不是很熟悉。
Can anyone provide a simple way on this? 任何人都可以提供一个简单的方法吗?
A simple solution is not to use RegEx at all. 一个简单的解决方案是根本不使用RegEx。 Use Template literals
使用模板文字
var module = 'm1',
taskId = 't1',
hash = 'h1';
var url = `/task/${module}?taskId=${taskId}#${hash}`;
var module = 'm1', taskId = 't1', hash = 'h1'; var url = `/task/${module}?taskId=${taskId}#${hash}`; document.body.innerHTML = url;
Using RegEx: 使用RegEx:
function replaceUrl(url, data) {
// Create regex using the keys of the replacement object.
var regex = new RegExp(':(' + Object.keys(data).join('|') + ')', 'g');
// Replace the string by the value in object
return url.replace(regex, (m, $1) => data[$1] || m);
}
function replaceUrl(url, data) { var regex = new RegExp(':(' + Object.keys(data).join('|') + ')', 'g'); return url.replace(regex, (m, $1) => data[$1] || m); } var updatedUrl = replaceUrl('/task/:module?taskId=:taskId#:hash', { module: 'm1', taskId: 't1', hash: 'h1' }); console.log(updatedUrl); document.body.innerHTML = updatedUrl;
You could write a very simple templating function to achieve this in ES5: 您可以编写一个非常简单的模板函数来实现ES5:
function template(string, obj){
var s = string;
for(var prop in obj) {
s = s.replace(new RegExp('{'+ prop +'}','g'), obj[prop]);
}
return s;
}
template('/task/{module}?taskId={taskId}#{hash}', {
module: 'foo',
taskId: 2,
hash: 'bar'
});
Fiddle: https://jsfiddle.net/j5hp2cfv/ 小提琴: https : //jsfiddle.net/j5hp2cfv/
You can use the form of String.prototype.replace that takes a function as an argument . 您可以使用String.prototype.replace的形式, 它将函数作为参数 。
Using your example this could look like: 使用您的示例,这可能看起来像:
var str = '/task/:module?taskId=:taskId#:hash&:missing';
var obj = {
module: 'm1',
taskId: 't1',
hash: 'h1'
};
function replaceUrl(url, data) {
var regex = /:(\w+)/g;
return url.replace(regex, function(match, p1) {
return data[p1] || ':' + p1;
});
}
replaceUrl(str, obj); // /task/m1?taskId=t1#h1&:missing
This method will handle all parameters you pass values in for and ignore ones that are missing. 此方法将处理您传入值的所有参数,并忽略丢失的参数。
I wrote a simple JavaScript function called stringInject to solve this exact problem I was having. 我写了一个名为stringInject的简单JavaScript函数来解决我遇到的这个问题。 It would allow you to do the following.
它允许您执行以下操作。 Find links to the code below.
找到下面代码的链接。
var str = "This is a {0} string for {1}"
var newStr = stringInject(str, ["test", "stringInject"]);
// This is a test string for stringInject
NPM / GitHub links: NPM / GitHub链接:
https://www.npmjs.com/package/stringinject https://www.npmjs.com/package/stringinject
https://github.com/tjcafferkey/stringinject https://github.com/tjcafferkey/stringinject
The Function 功能
function stringInject(str, arr) {
if (typeof str !== 'string' || !(arr instanceof Array)) {
return false;
}
return str.replace(/({\d})/g, function(i) {
return arr[i.replace(/{/, '').replace(/}/, '')];
});
}
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