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Code _ javascript skills calculated using the remaining javascript words

Source: Internet
Author: User
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In the function, the maxChars variable is specified first (the maximum number of characters available in the input zone. Note that this variable is a value that can be used for calculation). First, let's look at the HTML code:



Maximum text length: 250. Remaining: 250.
It can be seen that onkeyup is an event triggered when the user leaves the keyboard. The parameter passed is this (that is, the current document area)

Then let's take a look at the JS Code:

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