HTML字符串排版

发布于
2017-05-22

更新于
2017-05-22

我现在有HTML代码的字符串，想要对字符串进行排版，有没有什么可用的方法？

需要一款js插件，或者方法，能在项目里面转换用的。

比如原字符串是：

<div><p>This is a p</p><p>This is another p</p></div>

添加空格和换行，变成新的字符串:

<div>
    <p>This is a p</p>
    <p>This is another p</p>
</div>

html

html5 javascript

阅读 4.9k

4 个回答

mqycn

✓ 已被采纳

第一种方案想用正则做答没成功，没有成功。
整理了下思路，已经完美解决（自认为完美）。

function codeFormat(code, indent, tmpIndent){
    var indent = indent || '  ';
    var tmpIndent = tmpIndent || '\n';
    var preg = /<(\S*)([^>]*)>([\s\S]*?)<\/\1>/ig;
    return code.replace(preg, function($0, $1, $2, $3){
        return tmpIndent + '<' + $1 + $2 + '>'
            + codeFormat($3, indent, tmpIndent + indent)
            + ( $3.trim().substr(0,1) == '<' ? tmpIndent : '') 
            + '</' + $1 + '>';
    });
}
codeFormat("<div><p>This is a p</p><p>This is anothers p</p></div><div><p>This is a p</p><p>This is another p</p></div>");
/*
<div>
  <p>This is a p</p>
  <p>This is anothers p</p>
</div>
<div>
  <p>This is a p</p>
  <p>This is another p</p>
</div>
*/
codeFormat('<html><head><title></title></head><body class="haha"><div style="background:#C00;"><p>This is a p</p><p>This is another p</p></div></body></html>', '----');
/*
<html>
----<head>
--------<title></title>
----</head>
----<body class="haha">
--------<div style="background:#C00;">
------------<p>This is a p</p>
------------<p>This is another p</p>
--------</div>
----</body>
</html>
*/

以下是循环的老答案：

/*
    感觉没什么难度，一个循环
    遇见 >后跟<，换行
    遇见 < 缩进
    遇见 </ 取消缩进
*/
function codeFormat(code, indent){
    var indent = indent || "  ";    //缩进字符
    var tmpIndent = "";    //保存代码字符串
    var result = "", key = "", keyNext = "";
    for( var i = 0 ; i < code.length ; i++ ){
        key = code[i];
        keyNext = i < code.length-1 ? code[i+1] : "";
        if(key == "<"){
            if( keyNext == "/" ){
                tmpIndent = tmpIndent.substr(indent.length);
            }
            if( result[result.length-1] == "\n" ){
                result += tmpIndent;
            }
            if( keyNext != "/" ){
                tmpIndent += indent;
            }
        }
        result += key;
        if(key == ">" && keyNext == "<" ){
            result += "\n";
        }
    }
    return result;
}

codeFormat("<div><p>This is a p</p><p>This is another p</p></div>");
/*
<div>
  <p>This is a p</p>
  <p>This is another p</p>
</div>
*/
codeFormat('<html><head><title></title></head><body class="haha"><div style="background:#C00;"><p>This is a p</p><p>This is another p</p></div></body></html>', '    ');
/*
<html>
    <head>
        <title>
        </title>
    </head>
    <body class="haha">
        <div style="background:#C00;">
            <p>This is a p</p>
            <p>This is another p</p>
        </div>
    </body>
</html>
*/

Clark

3.4k2916

发布于
2017-05-23

为什么我这个问题一直被踩？还是一个不错的问题的嘛。。。。
@mqycn , @zhenguoli

这是朋友@candy写的一个方案：

import _ from 'lodash';

const splitOnTags = str => str.split(/(<\/?[^>]+>)/g).filter(line=>line.trim()!="");
const isTag = str => /<[^>!]+>/.test(str);
const isClosingTag = str => /<\/[^>]+>/.test(str);
const isSelfClosingTag = str => /<[^>]+\/>/.test(str);
const isOpeningTag = str => isTag(str) && !isClosingTag(str) && !isSelfClosingTag(str);

export default (str, indent) => {
  let depth = 0;
  indent = indent || '    ';

  return splitOnTags(str).map(item=>{
    if(isClosingTag(item)) {
      depth--;
    }

    const line = _.repeat(indent, depth) + item;

    if(isOpeningTag(item)) {
      depth++;
    } 

    return line;
  }).join('\n');
}