用循环替换简单的 Javascript [英] Simple Javascript replace with a loop

问题描述

我尝试用数组索引值替换字符串中的所有出现，如下所示.

I'm try to replace all occurances wihtin a string with the array index value as below.

var str = '<a href="{0}" title="{1}">{1}</a>';
var params= [];
params.push('Url', 'TitleDisplay');

for (i in params) {
    var x = /'{' + i + '}'/g;
    str = str.replace(x, params[i]);
}

无论我做什么，我似乎都无法让它发挥作用.删除 '/g' 仅适用于一场比赛，但不是全部.我知道这是基本的，但对于我来说，我无法让它工作.

No matter what I do, I cannot seem to get it to work. Dropping the '/g' works with one match, but not all. I know this is basic but for the lide of me I cannot get it to work.

推荐答案

Fiddle here

代码:

var rx = /{([0-9]+)}/g;
str=str.replace(rx,function($0,$1){return params[$1];});

replace 方法遍历字符串(因为正则表达式中的/g)并找到 {n} 的所有实例，其中 n 是一个数字.$1 捕获数字，函数将 {n} 替换为 params[n].

The replace method loops through the string (because of /g in the regex) and finds all instances of {n} where n is a number. $1 captures the number and the function replaces {n} with params[n].

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