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jquery creates DOM elements

无忌哥哥
无忌哥哥Original
2018-06-29 14:19:385095browse

jquery creates DOM elements

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>创建DOM元素</title>
</head>
<body>
</body>
</html>

Creating new elements is very troublesome to operate natively

The first step: Create new elements

var img = document.createElement(&#39;img&#39;)

The second step is for new elements Add content or attributes to elements

img.src = &#39;../images/zly.jpg&#39;
img.width = 200
img.style.borderRadius = &#39;10%&#39;
img.style.boxShadow = &#39;3px 3px 3px #888&#39;

The third step: Add new elements to the page

document.body.appendChild(img)

Using jquery will greatly simplify these operations

It can also be divided into three steps

The first step: Create a new element, at least a pair of tags, the angle brackets must not be omitted

var img = $(&#39;<img>&#39;)
var img = $(&#39;<img src="../images/zly.jpg" width="200">&#39;)
img.appendTo(&#39;body&#39;)

The second step: Add content or attributes to the new element

img.attr(&#39;src&#39;, &#39;../images/zly.jpg&#39;)
img.css(&#39;width&#39;,200)
img.css(&#39;border-radius&#39;,&#39;10%&#39;)
img.css(&#39;box-shadow&#39;,&#39;3px 3px 3px #888&#39;)

Three steps: Add to the page 

img.appendTo(&#39;body&#39;)

The above steps can be simplified: use jquery’s unique chain operation to complete, change a star 

$(&#39;<img>&#39;).attr(&#39;src&#39;, &#39;../images/gyy.jpg&#39;).css(&#39;width&#39;,&#39;200px&#39;).css(&#39;border-radius&#39;,&#39;10%&#39;).css(&#39;box-shadow&#39;,&#39;3px 3px 3px #888&#39;).appendTo(&#39;body&#39;)

In fact, when using the $() function to create elements, You can also pass in the second parameter and set the properties directly. Let’s further simplify these codes

$(&#39;<img>&#39;,{
src: &#39;../images/gyy.jpg&#39;,
title: &#39;我是高圆圆&#39;,
style: &#39;width:200px;border-radius:10%;box-shadow:3px 3px 3px #888&#39;,
click: function(){alert($(this).attr(&#39;title&#39;))}
}).appendTo(&#39;body&#39;)

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