Case Analysis of JavaScript waiting for File
This article mainly introduces the JavaScript waiting file case analysis of the relevant knowledge, the content is detailed and easy to understand, the operation is simple and fast, has a certain reference value, I believe that everyone after reading this JavaScript waiting file example analysis article will have a harvest, let's take a look.
JavaScript waits for files
If you create a function to load external resources, such as scripts or files, you cannot use the content until it is fully loaded.
This is the best time to use callbacks.
This example loads a HTML file (mycar.html) and displays the HTML file in the web page after the file is fully loaded:
Wait for the file:
Function myDisplayer (some) {
Document.getElementById ("demo"). InnerHTML = some
}
Function getFile (myCallback) {
Let req = new XMLHttpRequest ()
Req.open ('GET', "mycar.html")
Req.onload = function () {
If (req.status = = 200) {
MyCallback (this.responseText)
} else {
MyCallback ("Error:" + req.status)
}
}
Req.send ()
}
GetFile (myDisplayer)
In the above example, myDisplayer is used as a callback.
The function (function name) is passed as an argument to getFile ().
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