PHP STRCHR equivalence to JavaScript [duplicate] - javascript

This question already has answers here:
JavaScript or jQuery equivalent of PHP's strstr() function
(6 answers)
Closed 8 years ago.
Is there a function in javascript that is equivalent to strchr of php? Please help me. thank you.

You should try the indexOf method.

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The title is sort of self-explanatory, I couldn't find a similar question or explanation for this

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What's the meaning of $$("a") in JavaScript?, Is that something relevant to jQuery?
Typed it into browser's console, it works.
In Chrome $$ is an alias for document.querySelectorAll. Learn more on the expressions page.

Why does `window.window.window` work in JavaScript? [duplicate]

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It doesn't matter if you write window or window.window or window.window.window, it still works.
I wanted to know what is the logic behind this.
I also checked it will work for window * 144 and after 145 it won't.
Is this intended in the language?

How can I write javascript like this ruby code (array matching)? [duplicate]

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Closed 9 years ago.
This is my ruby code.
array1= [1,2,3,4,5]
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if (array1 & array2).size == 4
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How can I write the same thing in javascript? Is there any material like ruby-doc in javascript?
There isn't a native method do do it.
Have a look at here : Simplest code for array intersection in javascript
The best documentation I know about javascript and html5 is the Mozilla developer network.

Is there a way to trigger "find" in a browser through javascript? [duplicate]

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Does javascript allow for to trigger a "find" action with a keyword on the current page?
No, there's no cross-browser way to do this. (I don't even know of one browser that exposes that functionality.)

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