将画布中的图像保存到本地存储 [英] Saving image in canvas to local storage

问题描述

我正在尝试将我画布上的画圈保存到本地存储中，但我根本无法让它工作。

I'm trying to save my drawn circles on my canvas to the localstorage, but I just can't get it to work, at all.

到目前为止这是我在JS中的保存代码。

So far this is my save-code in JS.

function saveCanvas() {
var canvas = document.getElementById("imgCanvas"),
    doomslayer = canvas.toDataURL();

 if (typeof (localStorage) !== "undefined") {

    localStorage.setItem('imgCanvas', doomslayer);
 } else {
    document.getElementById("save").innerHTML.dataURL = "Local Storage not supported";
   }
}

function loadCanvas() {

var image = localStorage.getItem('imgCanvas');

document.getElementById('imgCanvas').src = image;
}

JSFiddle链接

现在终于开始工作吧！
工作小提琴:)

Got it to work now, finally! Working fiddle :)

推荐答案

您必须将保存的数据网址加载到图像中，然后使用drawImage将其加载到画布上

You must load the saved data url into an Image and then use drawImage to load it onto the canvas

IE限制：localStorage仅在提供的页面上可用（本地执行无效！）。

IE limitation: localStorage is only available on a served page (local execution won't work!).

// save to localStorage

localStorage.setItem("imgCanvas",canvas.toDataURL());

// reload from localStorage

var img=new Image();
img.onload=function(){
    context.drawImage(img,0,0);
}
img.src=localStorage.getItem("imgCanvas");

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