全部替换< img>标签与img替代文字 [英] Replace all <img> tag with img alt text

问题描述

我知道如何在php中执行此操作，但我需要在javascript / jquery中完成此操作。

I know how to do this in php, but I need this to be done in javascript/jquery.

我正在尝试以下内容：

$('#NewBox').html( $('#OldBox').html().Replace('/<img(.*)alt="(.*)"\>/g', "$2") );

我认为javascript没有preg_replace，我所知道的是替换方法。使用g应该用正则表达式中的第二个参数替换所有实例（是alt）。知道为什么这不起作用吗？

I don't think javascript has a preg_replace, and all I know of is the replace method. using "g" should replace all instances with the 2nd parameter from the regex (being alt). Any idea why this isn't working?

更新：
（希望这能更好地理解我想要的东西）

UPDATE: (hopefully this better understands what I want)

我有一个这样的字符串：

I have a string such as this:

var str = 'This is a string with <img src="./images/logo.png" alt="logo" /> an image'

我想用alt替换该字符串中的所有标签，所以它现在是：

I want to replace all tags inside of that string with the alt so it's now:

'This is a string with logo an image'

推荐答案

当您可以安全地使用解析工具时，应该避免使用正则表达式。 jQuery可以为你解析HTML。

You should avoid regexes when you can safely work with a parsing tool. jQuery can parse that HTML for you.

var str = 'This is a string with <img src="./images/logo.png" alt="logo" /> an image';
console.log('input: '+str);

// first create an element and add the string as its HTML
var container = $('<div>').html(str);

// then use .replaceWith(function()) to modify the HTML structure
container.find('img').replaceWith(function() { return this.alt; })

// finally get the HTML back as string
var strAlt = container.html();
console.log('output: '+strAlt);

输出：

input: This is a string with <img src="./images/logo.png" alt="logo" /> an image
output: This is a string with logo an image 

参见演示小提琴。

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