jQuery 或 JavaScript 等价于 PHP strpos 函数以在页面上查找字符串
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jQuery or JavaScript equivalent of PHP strpos function to find string on a page
提问by Tom
Is there an equivalent function in JavaScript or jQuery similar to strposin PHP?
JavaScript 或 jQuery 中是否有类似于strposPHP 中的等效函数？
I want to locate a string inside an element on a page. The string I'm looking for is:
我想在页面上的元素内找到一个字符串。我正在寻找的字符串是：
td class="SeparateColumn"
I would like something where I can run it like this to find:
我想要一些可以像这样运行的东西来找到：
if $("anystring")
then do it
回答by JAL
I assume you mean check whether a string contains a character, and the position in the string - you'd like to use the indexOf()method of a string in JS. Here are the relevant docs.
我假设您的意思是检查字符串是否包含字符以及字符串中的位置 - 您想indexOf()在 JS 中使用字符串的方法。以下是相关文档。
Okay, so you'd like to search the whole page! The :contains()selector will do that. See the jQuery docsfor :contains.
好的，所以您想搜索整个页面！该:contains()选择将这样做。见jQuery的文档进行:contains。
To search every element in the page, use
要搜索页面中的每个元素，请使用
var has_string = $('*:contains("search text")');
If you get jQuery elements back, then the search was a success. For example, on this very page
如果你得到 jQuery 元素，那么搜索就成功了。例如，在这个页面上
var has_string=$('*:contains("Alex JL")').length
//has_string is 18
var has_string=$('*:contains("horsey rodeo")').length
//has_string if 0. So, you could an `if` on this and it would work as expected.
回答by Spudley
You don't need jquery for this -- plain old Javascript will do just fine, using the .indexof()method.
为此，您不需要 jquery - 使用该.indexof()方法，普通的旧 Javascript 就可以了。
However if you really want an exact syntax match for PHP's strpos(), something like this would do it:
但是，如果您真的想要与 PHP 的 strpos() 完全匹配的语法，则可以这样做：
function strpos (haystack, needle, offset) {
var i = (haystack+'').indexOf(needle, (offset || 0));
return i === -1 ? false : i;
}
Note: This function taken from here: http://phpjs.org/functions/strpos:545
注意：此函数取自此处：http: //phpjs.org/functions/strpos: 545
