Javascript 简单的将图像转换为画布不工作
我无法让这个简单的代码工作。不明白为什么Javascript 简单的将图像转换为画布不工作,javascript,jquery,html5-canvas,Javascript,Jquery,Html5 Canvas,我无法让这个简单的代码工作。不明白为什么 $(document).ready(function() { function convertImageToCanvas(image) { var canvas = document.createElement("canvas"); canvas.width = image.width; canvas.height = image.height; canvas.getContext
$(document).ready(function() {
function convertImageToCanvas(image) {
var canvas = document.createElement("canvas");
canvas.width = image.width;
canvas.height = image.height;
canvas.getContext("2d").drawImage(image, 0, 0);
return canvas;
}
$('.img-class').each(convertImageToCanvas);
});
我做错了什么?您应该将
图像
变量替换为此
。通过param传递的图像
变量表示一个索引。此
值表示图像元素
请注意,您只是在创建canvas元素。您应该将画布附加到另一个DOM元素,以查看它在浏览器中的渲染效果
$(document).ready(function() {
function convertImageToCanvas() {
var canvas = document.createElement("canvas");
canvas.width = this.width;
canvas.height = this.height;
canvas.getContext("2d").drawImage(this, 0, 0);
return canvas;
}
$('.img-class').each(convertImageToCanvas);
});
看看代码笔。试试看
$(document).ready(function() {
// `i` : `index` , `image` : `DOM` `img` `element`
function convertImageToCanvas(i, image) {
var canvas = document.createElement("canvas");
canvas.width = image.width;
canvas.height = image.height;
var ctx = canvas.getContext("2d");
ctx.drawImage(image, 0, 0);
// do stuff
};
$('.img-class').each(convertImageToCanvas);
});
JSFIDLE
看