创建一个canvas元素并使用jQuery设置它的width和height属性 [英] Creating a canvas element and setting its width and height attributes using jQuery

问题描述

我只是想在jQuery中执行以下操作：

I was just trying to do the following in jQuery:

var newCanvas = $('<canvas/>',{'width':100,'height':200,'class':'radHuh'});
$(body).append(newCanvas);

这是工作（种类）并生成以下标记：

This is working (kind of) and generates the following markup:

<canvas style="width:100px; height:200px;" class="radHuh"></canvas>

因为大多数人可能知道 canvas 不太喜欢CSS维度，但是希望有一个width和height属性，所以这个对象创建失败了。

As most of you might know canvas elements don't really like CSS dimensions but expect a width and height attribute, so this object creation failed for me.

我知道我可以做：

var newCanvas = $('<canvas/>',{'class':'radHuh'}).attr({'width':100,'height':200});

，但我只是想知道如果有任何方法告诉jQuery <$ c $通过 $（'element'，{attributes}）创建元素时，应将 width 和 height ）而不是CSS？

instead, but I was just wondering nonetheless if there is any way of telling jQuery that width and height should be treated as attributes when creating the element via $('element',{attributes}) and not as CSS?

推荐答案

jQuery尝试将每个属性名称与一个jQuery函数名称。匹配的函数被调用。

jQuery try to match each attribute name with a jQuery function name. Matched functions are called.

width 和 height jQuery函数，所以你的原始代码等效于：

width and height are jQuery functions, so your original code is equivalent to this:

  var newCanvas = 
    $('<canvas/>',{'class':'radHuh'})
    .width(100)
    .height(100);

width（值）和 height（value）函数设置 CSS 宽度和元素的高度。

width(value) and height(value) functions set CSS width and height of an element.

相关jQuery源代码行（ https://github.com/jquery/jquery/blob/master/src/attributes.js#L308 ）

Relevant jQuery source code line (https://github.com/jquery/jquery/blob/master/src/attributes.js#L308)

if ( pass && name in jQuery.attrFn ) {

attrFn 对象定义（ https://github.com/jquery/jquery/blob/master/src/attributes.js#L288 ）：

attrFn: {
    val: true,
    css: true,
    html: true,
    text: true,
    data: true,
    width: true,
    height: true,
    offset: true
},

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