元素是否包含指定的字符串（纯JS）？
[英]Does an element contain a specified string (pure JS)?
问题描述
Given this: 
鉴于这种：
<p>knownString-randomString</p>
How do I find all paragraphs in a document that contain "knownString-," using pure JavaScript only? 如何仅使用纯JavaScript查找包含“ knownString-”的文档中的所有段落？
For each instance of <p>knownString-randomString</p> , I need to split "knownString-randomString" at the hyphen( - ) and store "randomString" in a variable for later use. 对于<p>knownString-randomString</p>每个实例，我需要在连字符（ - ）处拆分“ knownString-randomString”，并将“ randomString”存储在变量中以备后用。
Thanks. 谢谢。
5 个解决方案
解决方案1
1 已采纳 2016-02-28 01:23:03
Get your elements
得到你的元素 var paragraphs = document.getElementsByTagName('p');
var段落= document.getElementsByTagName（'p'）;
2. For loop with check and split your string 2. for循环检查并拆分字符串
for(var i = 0; i < paragraphs.length; i++){ if(paragraphs[i].innerHTML.search('knownString') > -1){ randomString = paragraphs[i].innerHTML.split('-')[1]; } }
解决方案2
1 2016-02-28 01:28:49
Here is one way: 这是一种方法：
function FindRandomStrings()
{
var allParagraphs = document.getElementsByTagName("p");
var regex = /knownString-(.*)/;
var result = [];
var match;
var i;
for (i = 0; i < allParagraphs.length; i++)
{
match = regex.exec(allParagraphs[i].innerHTML);
if (match)
{
result.push(match[1]);
}
}
return result;
}
解决方案3
0 2016-02-28 01:15:23
If your paragraphs are inside some other element, either a div, or ultimately the <body> , you can select those with jQuery $('divID p'), iterate through them, and use split() to separate the known and unknown strings into an array. 如果您的段落位于某个其他元素（一个div或最后一个<body> ，则可以选择带有jQuery $（'divID p'）的那些元素，对其进行迭代，然后使用split（）分隔已知字符串和未知字符串排列成一个数组。
var ArrayElement = split("knownString-randomString");
ArrayElement(0) will have your knownString, and ArrayElement(1) will have your randomString. ArrayElement（0）将具有您的knownString，而ArrayElement（1）将具有您的randomString。
解决方案4
0 2016-02-28 01:27:24
var randomStrings = [];
var ps = document.querySelectorAll('p');
for(var i = 0; i < ps.length; i++) {
if(ps[i].textContent.startsWith('knownString')) {
randomStrings.push(ps[i].textContent.split('-')[1]);
}
}
The variables you need would be stored in randomStrings 您需要的变量将存储在randomStrings
解决方案5
0 2016-02-28 01:28:10
- Convert the desired string into a regular expression. 将所需的字符串转换为正则表达式。
- Retrieve all paragraphs (modified as desired using
querySelectorAllselectors).检索所有段落（使用querySelectorAll选择器根据需要进行修改）。 - Iterate through all the paragraphs. 遍历所有段落。
- For each paragraph, get the text and search it with the regular expression. 对于每个段落，获取文本并使用正则表达式进行搜索。
- If there is a match, add it to an accumulating list of "hits". 如果有匹配项，请将其添加到“匹配”的累积列表中。
var knownString = "knownString"; var regex = new RegExp(knownString + "\\\\-(.*)"); var pars = document.querySelectorAll("p"); var results = []; [].forEach.call(pars, function(par) { var x = par.firstChild.nodeValue.match(regex); if (x) results.push(x[1]); }); alert(results);
<p>something else</p> <p>knownString-randomString1</p> <p>knownString-randomString2</p>
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