如何在js中列出字符串中的所有html标签

Question

I have one string which contain both texts and many html tags with there respective attribute and its value for example:-

I am trying to takeout all the tag names and push inside array note:- I have two custom function named trim() and null() that removes all the spaces of string and checks whether supplied argument is null.

 var a = ` <div class="box"> <span id="box-span"> <p class="texts">very long texts goes here.</p> <p class="texts">very long texts goes here</p> <p class="texts">very long texts goes here</p> </span> </div>`; var tags = function(string) { var array = ['hello']; var string = a.trim(''); var len = string.length; for (var i = 0; i < len; i++) { index1 = string.indexOf('>'); index2 = string.indexOf('<'); index3 = string.indexOf('/'); if (null(index1) && index1 !== -1 && null(index2) && index2 !== -1) { // if somthing is found x = string.substr(index1, index2); g = x.indexOf('/') // for end tag if (null(g) || g !== -1) { x = string.substr(index1, index2 - 1); array.push(x); } else { array.push(x); } z = string.substr(index2); // new string with reducing 1 tag if (z.length < len && z.length > 0) { tags(z) } else { return array; break; } } } } console.log(tags(a)); 

this is my idea but it dosn't works.

Answer 1

Updated ; only fetch unique tags (no duplicates).

Something like will put you on the path to strip all availble tags from HTML...

  var a = `<div class="box"> <span id="box-span"> <p class="texts">very long texts goes here.</p> <p class="texts">very long texts goes here</p> <p class="texts">very long texts goes here</p> </span> </div>`; var temp = document.createElement("div"); temp.innerHTML = a; var all = temp.getElementsByTagName("*"); var tags = []; for (var i = 0, max = all.length; i < max; i++) { var tagname = all[i].tagName; if (tags.indexOf(tagname) == -1) { tags.push(tagname); } } console.log(tags); 

https://jsfiddle.net/9phzt1y2/2/

Answer 2

 var str= `<div class="box"> <span id="box-span"> <p class="texts">very long texts goes here.</p> <p class="texts">very long texts goes here</p> <p class="texts">very long texts goes here</p> </span> </div>`; var tag = document.createElement("div"); tag.innerHTML = str; var t = tag.getElementsByTagName("*"); var ele = []; for (var i = 0; i < t.length; i++) { ele.push(t[i].tagName); } console.log(ele);