> For the complete documentation index, see [llms.txt](https://easonwang.gitbook.io/web_advance/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://easonwang.gitbook.io/web_advance/js_ge_shi_zhuan_huan.md).

# JS 格式轉換

## JS 格式轉換

## 1.String to DOM

使用DOM parser

```
var xmlString = "<div id='foo'><a href='#'>Link</a><span></span></div>"
  , parser = new DOMParser()
  , doc = parser.parseFromString(xmlString, "text/xml");
doc.firstChild // => <div id="foo">...
doc.firstChild.firstChild // => <a href="#">...
```

<http://stackoverflow.com/questions/3103962/converting-html-string-into-dom-elements>

## 2. `'\/' === '/' in JavaScript`

你可以試著在瀏覽器console.log輸入

`"asdf<div><br><\/div><div>dff<\/div>"`

他會自動轉為

`"asdf<div><br></div><div>dff</div>"`

{% embed url="<http://stackoverflow.com/questions/1580647/json-why-are-forward-slashes-escaped>" %}

## 3. Number to dollor

```javascript
Number.prototype.format = function(n, x) {
  const re = '\\d(?=(\\d{' + (x || 3) + '})+' + (n > 0 ? '\\.' : '$') + ')';
  return this.toFixed(Math.max(0, ~~n)).replace(new RegExp(re, 'g'), '$&,');
};
```