首页 \ 问答 \ 是否有必要编写HEAD,BODY和HTML标签?(Is it necessary to write HEAD, BODY and HTML tags?)

是否有必要编写HEAD,BODY和HTML标签?(Is it necessary to write HEAD, BODY and HTML tags?)

是否有必要编写<html><head><body>标签?

例如,我可以做这样一个页面:

<!DOCTYPE html>     
    <meta http-equiv="Content-type" content="text/html; charset=utf-8">
    <title>Page Title</title>
    <link rel="stylesheet" type="text/css" href="css/reset.css">
    <script src="js/head_script.js"></script><!-- this script will be in head //-->


<div>Some html</div> <!-- here body starts //-->

    <script src="js/body_script.js"></script>

和Firebug正确分离头和身体: 在此输入图像说明

W3C验证说这是有效的。

但我很少在网上看到这种做法。

有没有理由写这些标签?


Is it necessary to write <html>, <head> and <body> tags?

For example, I can make such a page:

<!DOCTYPE html>     
    <meta http-equiv="Content-type" content="text/html; charset=utf-8">
    <title>Page Title</title>
    <link rel="stylesheet" type="text/css" href="css/reset.css">
    <script src="js/head_script.js"></script><!-- this script will be in head //-->


<div>Some html</div> <!-- here body starts //-->

    <script src="js/body_script.js"></script>

And Firebug correctly separates head and body: enter image description here

W3C Validation says it's valid.

But I rarely see this practice on the web.

Are there any reason to write these tags?


原文:https://stackoverflow.com/questions/5641997
更新时间:2022-09-26 06:09

最满意答案

您需要使用.prop()来设置checked属性

$("#checkAll").click(function(){
    $('input:checkbox').not(this).prop('checked', this.checked);
});

演示: 小提琴


You need to use .prop() to set the checked property

$("#checkAll").click(function(){
    $('input:checkbox').not(this).prop('checked', this.checked);
});

Demo: Fiddle

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