What is the difference between onLoad, onDomready, No wrap - in <head>, and No wrap - in <body>?

前端未结

关注

 5  1701

I use JSFiddle for editing my code. However, in certain codes when I\'m running JavaScript or jQuery, it doesn\'t work unless I select \"No wrap -

相关标签:

5条回答

栀梦

2020-12-06 06:21
The onLoad and onDomready wrap the code so that the JavaScript runs when the document load or DOM ready events fire. It's as if your wrote your code like this:

Stackoverflow Ref
```
 <script type="text/javascript"> 
    //<![CDATA[ 
      window.onload=function(){ /* your js here */ } 
   //]]> 
</script> 
```
The no wrap options are if you added your script tag to the head or the body tags of the document like how you're probably used to doing it.
```
 <html> 
 <head> 
       <title>Stuff</title> 
 <script> 
   /* your code */ 
 </script> 
 </head> 
```
0 讨论(0)
发布评论:

提交评论
- 加载中...
一个人的身影

2020-12-06 06:24
onLoad:
- This means wrap the code so it will run in onLoad window event. This runs when the entire page has loaded (such as images).
onDomReady:
- This means to wrap the code so it will run in onDomReady window event. This runs when the DOM has loaded.
no wrap - in <head>:
- This will place your JavaScript code in the <head> section
no wrap - in <body>:
- This will place your JavaScript code in the <body> section
I would like to note that more information can be found in jsFiddle's documentation.
0 讨论(0)
发布评论:

提交评论
- 加载中...
挽巷

2020-12-06 06:34

onload means all sources in the page are loaded ( include image css and js), domReady just means the dom tree is done.

0 讨论(0)
发布评论:

提交评论
- 加载中...
不要未来只要你来

2020-12-06 06:47

The load event is a general “loading complete” signal. It is supported by many elements. For example, external SCRIPTand IMG, IFRAME trigger it when downloading of their content finishes.

The DOMContentLoaded event triggers on document when the page is ready. It waits for the full HTML and scripts, and then triggers.All browsers except IE<9 support it.

0 讨论(0)
发布评论:

提交评论
- 加载中...

眼角桃花

2020-12-06 06:47

More information about onDomready.

Below is how JSFiddle actually wraps our codes to run. They support the browsers which do not have addEventListener method to listen to DOMContentLoaded event.

<script type="text/javascript">
//<![CDATA[
    var VanillaRunOnDomReady = function() {
        // Your own JS codes are placed here.
    }

    var alreadyrunflag = 0;

    if (document.addEventListener)
        document.addEventListener("DOMContentLoaded", function(){
            alreadyrunflag=1; 
            VanillaRunOnDomReady();
        }, false);
    else if (document.all && !window.opera) {
        document.write('<script type="text/javascript" id="contentloadtag" defer="defer" src="javascript:void(0)"><\/script>');
        var contentloadtag = document.getElementById("contentloadtag")
        contentloadtag.onreadystatechange=function(){
            if (this.readyState=="complete"){
                alreadyrunflag=1;
                VanillaRunOnDomReady();
            }
        }
    }

    window.onload = function(){
      setTimeout("if (!alreadyrunflag){VanillaRunOnDomReady}", 0);
    }
//]]>
</script>

0 讨论(0)