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测试jquery选择器速度
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<!DOCTYPE html> | |
<html> | |
<head> | |
<meta charset="utf-8"/> | |
<title></title> | |
<style> | |
.table { | |
width: 800px; | |
height: 600px; | |
background-color: #fafafa; | |
margin: 36px auto; | |
} | |
table { | |
border-spacing: 0; | |
width: 100%; | |
border: 1px solid #ACACAC; | |
border-radius: 3px; | |
} | |
table > thead > tr > th { | |
word-break: break-all; | |
word-wrap: break-word; | |
border-bottom: 2px solid #ddd; | |
height: 30px; | |
vertical-align: bottom; | |
} | |
table > tbody > tr > td { | |
word-break: break-all; | |
word-wrap: break-word; | |
border-bottom: 1px solid #ddd; | |
height: 30px; | |
vertical-align: middle; | |
text-align: center; | |
} | |
table > thead > tr { | |
display: table-row; | |
vertical-align: inherit; | |
border-color: inherit; | |
} | |
table > tbody > tr { | |
display: table-row; | |
vertical-align: inherit; | |
border-color: inherit; | |
} | |
.update { | |
width: 66px; | |
padding-top: 4px; | |
padding-bottom: 4px; | |
border-radius: 3px; | |
margin: 6px auto; | |
color: #fff; | |
background-color: #369; | |
cursor: pointer; | |
} | |
</style> | |
</head> | |
<body> | |
<div class="table"> | |
<table> | |
<thead> | |
<tr> | |
<th>用户名</th> | |
<th>性别</th> | |
<th>邮箱</th> | |
<th>地址</th> | |
<th>操作</th> | |
</tr> | |
</thead> | |
<tbody> | |
</tbody> | |
</table> | |
</div> | |
<script src="bower_components/jquery/dist/jquery.min.js"></script> | |
<script> | |
$(function() { | |
createList(function() { | |
updateListItem(); | |
}); | |
}); | |
function createList(fn) { | |
$.get('http://localhost:63342/test01/querylist.json', function(info) { | |
var arr = info.result; | |
$.each(arr, function(i, obj) { | |
console.log(obj); | |
var name = obj.userName, | |
email = obj.email, | |
gender = obj.gender, | |
address = obj.address, | |
userId = obj.userId; | |
var strHtml = '<tr><td>'+name+'</td><td>'+gender+'</td><td>'+email+'</td><td>'+address+'</td><td><div class="update" name="'+userId+'">修改</div></td></tr>'; | |
$('tbody').append(strHtml); | |
}); | |
typeof fn == 'function' && fn(); | |
}) | |
} | |
function updateListItem() { | |
$('.update').on('click', function() { | |
var $this = $(this); | |
var userId = $this.attr('name'); | |
$.get('http://localhost:63342/test01/querylist.json', function(info) { | |
$.each(info.result, function(i, obj) { | |
if(obj.userId === userId) { | |
console.log(obj); | |
} | |
}) | |
}) | |
}) | |
} | |
function testSpeed(fn) { | |
var begin = new Date; | |
for (var i = 0; i < Math.pow(10, 5); i++) { | |
typeof fn === 'function' && fn(); | |
} | |
var end = new Date; | |
console.log(end - begin); | |
} | |
testSpeed(function() { | |
$('table').find('tbody'); | |
}); // -> 1920ms | |
testSpeed(function() { | |
$('table').children('tbody'); | |
}); // -> 4911ms | |
testSpeed(function() { | |
$('table>tbody'); | |
}); // -> 2170ms | |
testSpeed(function() { | |
$('table tbody'); | |
}); // -> 2385ms | |
testSpeed(function() { | |
document.getElementsByTagName('table')[0].getElementsByTagName('tbody'); | |
}); // -> 198ms | |
</script> | |
</body> | |
</html> |
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