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Use closures to simply encapsulate setTimeout to avoid errors_javascript tips

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Release： 2016-05-16 17:29:17

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When writing js scripts, some spelling functions are often used, such as calling setTimeout

Copy code The code is as follows:

 
var msgalert="test"; 
function TestAlert(msg) 
{ 
alert(msg) 
} 

$(document).ready( function () { 
$("#btnCancel").click(function (e) { 
setTimeout("TestAlert(" msgalert ")",1000); 
}); 
}) 

After checking for a long time, why the dialog box does not pop up. After checking for a long time, I discovered that a pair of single quotes

was missing. Copy the code The code is as follows:

 
$(document).ready(function () { 
$("#btnCancel").click(function (e) { 
setTimeout("TestAlert('" msgalert "')",1000 ; 🎜>

Copy code

The code is as follows:

var msgalert="test"; function dalayAlert(msg ,time ){ setTimeout( TestAlert(msg), time

);

} 
function TestAlert(msg) 
{ 
alert(msg) 
 } 

$(document).ready(function () { 
$("#btnCancel").click(function (e) { 
dalayAlert(msgalert,1000) 
}) ; 
}) 

 
Due to the use of closures, it is much simpler and it is easy to check for errors.

Related labels：

settimeout encapsulation Closure

source：php.cn

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