settimeout () Usage and attention problems in JavaScript

settimeout (expression, interaction time)
The delay time/interaction time is in Hao seconds (1000ms=1s) settimeout at execution time, after a specified time delay after loading, execute an expression once

SetTimeout at execution time, it executes an expression at a specified time, after it has been loaded

1, Basic usage:

Execute a piece of code:

The code is as follows	Copy Code
var i=0; SetTimeout ("I+=1;alert (i)", 1000);

To perform a function:

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var i=0; settimeout (function () {I+=1;alert (i);},1000);

Note the difference between the two methods above.

SetTimeout () issues to be noted

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<script type= "Text/javascript" > function Test () { Alert ("I am global"); } function Myfun () { function Test () { Alert ("I am Partial"); } settimeout ("Test ()", 2000); To invoke global test settimeout (test, 5000); To call local test } Myfun (); </script>

The result is the first alert out of "I am global" and then alert out "I am part of"!