javascript心形,javascript心形代码

microbit.直接刷入怎么使用

将micro：bit连接到电脑。

第一步：将micro：bit连接到电脑，使用microUSB数据线将micro：bit与电脑连接。你的micro：bit会在“我的电脑”上以“MICROBIT”的名称显示出来，不过要注意，它并不是一个普通的U盘哦。

第二步：在电脑上给它编程，你可以用MakeCode编辑器，或者Python为micro：bit进行编程。MakeCode编辑器采用的是拖放积木式的图形化编程，内核语言是JavaScript。在这个例子中，能够让micro：bit上显示闪烁的心形图案。Python编辑器允许用户使用目前流行的Python语言进行编程。试试这个例子，同样能够让micro：bit上显示闪烁的心形图案哦。

第三步：把程序下载到电脑上点击编辑器中的Download（下载）按钮。一个名为“hex”类型的文件会下载到你的电脑里，这是一种专门供micro：bit读取的小体积文件。一旦完成hex文件下载，你可以把它拷贝到micro：bit上，就像拷贝一个普通文件到U盘上一样。在Windows系统中，你也可以右键单击hex文件，选择“发送到→MICROBIT”。

第四步：玩起来当micro：bit在读取程序时会暂停运行，同时后面的黄色LED开始闪烁。一旦完成读取，程序会自动开始运行。

相关问答

Q1: QQ空间免费欢迎动画代码

5.欢迎动画 足球: javascript:window.top.space_addItem(14,5242,0,0,1,1,0);

欢迎来我家:javascript:window.top.space_addItem(14,4386,0,0,1,1,0);

幽夜幕: javascript:window.top.space_addItem(14,5002,0,0,1,1,0);

与你分享:javascript:window.top.space_addItem(14,4387,0,0,1,1,0);

月光马 :javascript:window.top.space_addItem(14,5077,0,0,1,1,0);

分享:javascript:window.top.space_addItem(14,5329,0,0,1,1,0);

冲吧跟斗云:javascript:window.top.space_addItem(14,4333,0,0,1,1,0);

蓝色大美女 javascript:window.top.space_addItem(14,7983,0,0,1,1,0);

再给你点别的吧

6. 漂浮

梦的希望 javascript:window.top.space_addItem(5,609,0,0,1,1,0);

播放器 旋律 javascript:window.top.space_addItem(6,1228,0,0,200,200,0);

皮肤（小窝）灰色BUG javascript:window.top.space_addItem(1,2882,0,0,0,1,1);

灰色BUG javascript:window.top.space_addItem(1,6300,0,0,0,0,1);

强生可伶可俐 javascript:window.top.space_addItem(1,10144,0,0,0,1,0);

强生可伶可俐 javascript:window.top.space_addItem(1,10425,0,0,0,1,1);

试（老女人） javascript:window.top.space_addItem(1,11762,0,0,0,1,1);

全屏 天蓝色 javascript:window.top.space_addItem(1,11762,0,0,0,1,94);

导航 粉可爱BUG空导航 javascript:window.top.space_addItem(13,4332,0,0,600,200,0);

航睡美人（很漂亮哦） javascript:window.top.space_addItem(13,9758,0,0,200,600,0);

透明公告栏LOVELETTER javascript:window.top.space_addItem(12,1072,0,0,96,96,1)

7.相框

青黄搭配爱心形相册代码：javascript:window.top.space_addItem(16,21910,0,80,500,500,0);

粉紫可爱心形相册代码：javascript:window.top.space_addItem(16,21911,0,80,500,500,0);

红框绿叶柔情相册代码：javascript:window.top.space_addItem(16,21912,0,80,500,500,0);

javascript:window.top.space_addItem(16,21903,0,80,500,500,0);

8. 播放器

新的: 旋律 javascript:window.top.space_addItem(6,1228,0,0,200,200,0);

以前:

blue:javascript:window.top.space_addItem(6,676,0,0,200,200,0);

茶色:javascript:window.top.space_addItem(6,702,0,0,200,200,0);

水晶年代:javascript:window.top.space_addItem(6,703,0,0,200,200,0);

1.最新qq空间免费鼠标代码：打开装扮空间，在地址栏输入一下代码，随便移动某一模块，效果满意就点击保存。代码如下：

javascript:window.top.space_addItem(4,5535,0,0,1,1,0);

javascript:window.top.space_addItem(4,5837,0,0,1,1,0);

javascript:window.top.space_addItem(4,1151,0,0,0,1,0); （鹰）

2.qq空间10月免费导航代码：

横副(粉红)javascript:window.top.space_addItem(13,5503,0,0,600,200,0);

心形 javascript:window.top.space_addItem(13,9114,0,0,200,600,0);

javascript:window.top.space_addItem(13,5145,0,0,200,600,0); 五星

以前的:

清甜爽口:javascript:window.top.space_addItem(13,4384,0,0,150,700,0);

流金岁月:javascript:window.top.space_addItem(13,5330,0,0,150,700,0);

摘星:javascript:window.top.space_addItem(13,5145,0,0,150,700,0);

深海奥妙:javascript:window.top.space_addItem(13,5003,0,0,150,700,0);

4.皮肤

大雁 javascript:window.top.space_addItem(1,12736,0,80,0,0,123);

全黑 javascript:window.top.space_addItem(1,12736,0,80,0,0,93);

javascript:window.top.space_addItem(1,8669,100,80,100,100,123); 两个人

javascript:window.top.space_addItem(1,7513,0,80,0,0,94); 清 海线

黑暗世界

javascript:window.top.space_addItem(1,9475,0,0,1,1,94);

快乐十分

javascript:window.top.space_addItem(1,8674,0,80,100,100,94);

静悄悄

javascript:window.top.space_addItem(1,8669,100,80,100,100,94);

蓝色

javascript:window.top.space_addItem(1,11762,0,0,96,96,94);

全红

javascript:window.top.space_addItem(1,11273,0,80,0,0,93);

可爱_浪漫

javascript:window.top.space_addItem(1,4703,0,80,0,0,94);

浪漫爱情

javascript:window.top.space_addItem(1,7513,0,80,0,0,94);

免费黑色皮肤代码

javascript:window.top.space_addItem(1,12736,0,80,0,0,93);

黄色免费皮肤代码

javascript:window.top.space_addItem(1,7513,0,80,0,0,93);

紫色免费皮肤代码

javascript:window.top.space_addItem(1,7510,0,80,0,0,93);

绿色免费皮肤代码

javascript:window.top.space_addItem(1,7619,0,80,0,0,93);

白色免费皮肤代码

javascript:window.top.space_addItem(1,4703,0,80,0,0,94);

灰色免费皮肤代码

javascript:window.top.space_addItem(1,6300,0,0,0,0,1);

灰色免费皮肤代码（小窝）

javascript:window.top.space_addItem(1,2882,0,0,0,1,1);

强生可伶可俐

javascript:window.top.space_addItem(1,10425,0,0,0,1,1);

强生可伶可俐 两个美女

javascript:window.top.space_addItem(1,10144,0,0,0,1,0);

强生广告美女 一个美女

javascript:window.top.space_addItem(1,11762,0,0,0,1,1);

全屏 天蓝色

javascript:window.top.space_addItem(1,11762,0,0,0,1,94);

代码一：静悄悄

代码：javascript:window.top.space_addItem(1,8669,100,80,100,100,94);

代码二：快乐十分

代码：javascript:window.top.space_addItem(1,8674,0,80,100,100,94);

代码三：蓝色

代码：javascript:window.top.space_addItem(1,11762,0,0,96,96,94);

以前的:

最美的:javascript:window.top.space_addItem(1,4323,0,80,0,0,90);

夜光:javascript:window.top.space_addItem(1,7510,0,0,1,1,94);

最美的花:javascript:window.top.space_addItem(1,7513,0,0,0,0,93);

粉红花瓣:javascript:window.top.space_addItem(1,4693,0,0,0,0,93);

QQ之声:javascript:window.top.space_addItem(1,15306,0,0,1,1,94);

QQ三国:javascript:window.top.space_addItem(1,15166,0,80,0,0,94);

纯黑:javascript:window.top.space_addItem(1,13046,0,80,0,0,93);(黄钻)

纯蓝:javascript:window.top.space_addItem(1,1,0,0,0,0,93);

纯白:javascript:window.top.space_addItem(1,5669,0,80,0,0,93);

纯橙:javascript:window.top.space_addItem(1,15306,0,0,0,0,93);

以上都是我最近总结的

Q2: 怎么样制作JavaScript心形代码

脚本说明:

第一步:把如下代码加入body区域中

style type="text/css"

body

{

background-color:#FFFFFF;

font-family: Arial;

font-size:10pt;

}

/style

script

text=new Array('www','njcatv','net','需要放大的

／＼／＼

＼ ／

＼／

文字')

var numText=4

color=new Array('#000000','#2F2F2F','#4F4F4F','#7F7F7F','#408080')

var numColors=5

var endSize=70

var Zspeed=30

var Cspeed=200

var font='Arial Black'

var hide=false

var size=10

var gonum=0

var ie, n;

if (document.all) {

n=0

ie=1

zoomText='document.all.zoom.innerText=text[num]'

zoomSize='document.all.zoom.style.fontSize=size'

closeIt=""

fadeColor="document.all.zoom.style.color=color[num]"

}

if (document.layers) {

n=1;ie=0

zoomText=""

zoomSize="document.zoom.document.write('p align=\"center\" style=\"font-family:'+font+'; font-size:'+size+'px; color:'+color[0]+'\"'+text[num]+'/p')"

closeIt="document.zoom.document.close()"

fadeColor="document.zoom.document.write('p align=\"center\" style=\"font-family:'+font+'; font-size:'+endSize+'px; color:'+color[num]+'\"'+text[numText-1]+'/p')"

}

function zoom(num,fn){

if (sizeendSize){

eval(zoomText)

eval(zoomSize)

eval(closeIt)

size+=5;

setTimeout("zoom("+num+",'"+fn+"')",Zspeed)

}else{

eval(fn);

}

}

function fadeIt(num){

if (numnumColors){

eval(fadeColor)

eval(closeIt)

num+=1;

setTimeout("fadeIt("+num+")",Cspeed)

}else{

hideIt()

}

}

function hideIt(){

if(hide){

if(ie)document.all.zoom.style.visibility="hidden"

if(n)document.layers.zoom.visibility="hidden"

}

}

function init(){

if(ie){

document.all.zoom.style.color=color[0]

document.all.zoom.style.fontFamily=font

}

if(ie || n) go(0)

}

function go(num){

gonum+=1

size=10

if(numnumText){

zoom(num,'go('+gonum+')')

}else{

fadeIt(0)

}

}

/script

div id="zoom" align="center" style="position:absolute; top:150"

Q3: 哪里有免费的QQ空间代码 最新的

QQ空间代码使用方法

以下提供可用的QQ空间各种免费代码（免费的基本都在这里了）

QQ空间免费皮肤代码：

最美的花

javascript:window.top.space_addItem(1,4693,0,80,0,0,94);

静悄悄

javascript:window.top.space_addItem(1,8669,100,80,100,100,94);

原始

javascript:window.top.space_addItem(1,26341,80,80,100,100,94);

黑色背景代码

javascript:window.top.space_addItem(1,26498,80,0,0,0,93);

黑色烛光

javascript:window.top.space_addItem(1,26497,0,80,0,0,30);

白色皮肤：

javascript:window.top.space_addItem(1,1304,200,0,0,50,21);

适用于任何风格 (打上代码会闪一下，保存刷新一次就能显示白色皮肤了）

小窝模式专用免费皮肤代码：

这些代码只有在小窝模式下才能显示使用：登录QQ空间，点右上方“装扮空间”→上方“高级设置”（左边板式布局）→设置板式：选择小窝，再点空间右上方“保存”。

绿色小窝 （皮肤）

javascript:window.top.space_addItem(1,10426,0,0,0,0,27); 河流

javascript:window.top.space_addItem(1,1304,0,0,0,1,0); （灰白色）

蓝色小牛 javascript:window.top.space_addItem(1,6573,0,0,1,1,0);

白色小牛 javascript:window.top.space_addItem(1,6574,0,0,1,1,0);

黑色小牛 javascript:window.top.space_addItem(1,6575,0,0,1,1,0);

灰色小牛 javascript:window.top.space_addIten(1,6576,0,0,1,1,0);

橘黄色小牛 javascript:window.top.space_addItem(1,6572,0,0,1,1,0);

QQ空间免费开场动画代码：

流星 javascript:window.top.space_addItem(14,26500,0,0,0,0,0);

烛愿 javascript:window.top.space_addItem(14,26501,0,0,0,0,0);

感同身受

javascript:window.top.space_addItem(14,26499,0,0,0,0,0);

欢迎来我家

javascript:window.top.space_addItem(14,4386,0,0,1,1,0);

与你分享

javascript:window.top.space_addItem(14,4387,0,0,1,1,0);

月光马 javascript:window.top.space_addItem(14,5077,0,0,1,1,0);

幽夜幕 javascript:window.top.space_addItem(14,5002,0,0,1,1,0);

分享 javascript:window.top.space_addItem(14,5329,0,0,1,1,0);

QQ空间免费导航代码：

粉色女生

javascript:window.top.space_addItem(13,9758,0,0,200,600,0);

竖着的五星

javascript:window.top.space_addItem(13,5145,0,0,200,600,0);

美妙音符

javascript:window.top.space_addItem(13,5330,0,0,200,600,0);

清甜爽口

javascript:window.top.space_addItem(13,4384,0,0,150,700,0);

流金岁月

javascript:window.top.space_addItem(13,5330,0,0,150,700,0);

摘星

javascript:window.top.space_addItem(13,5145,0,0,150,700,0);

深海奥妙

javascript:window.top.space_addItem(13,5003,0,0,150,700,0);

竖着的导航

javascript:window.top.space_addItem(13,1,100,80,0,0,94);

心爱花藤

javascript:window.top.space_addItem(13,9114,0,0,200,600,0);

鱼 javascript:window.top.space_addItem(13,5003,0,0,200,600,0);

犯困 javascript:window.top.space_addItem(13,46737,0,0,100,500,0);

乐肤洁导航

javascript:window.top.space_addItem(13,10427,0,0,200,600,0);

隐藏导航代码

javascript:window.top.space_addItem(13,4332,0,0,600,200,0);

QQ空间免费播放器代码：

旋律胶囊

javascript:window.top.space_addItem(6,1228,0,0,200,200,0);

水晶传说

javascript:window.top.space_addItem(6,703,0,0,200,200,0);

怀旧年代

javascript:window.top.space_addItem(6,702,0,0,200,200,0);

蓝色简洁

javascript:window.top.space_addItem(6,676,0,0,200,200,0);

QQ空间免费鼠标代码：

javascript:window.top.space_addItem(4,4966,0,0,0,1,0); 小绿人

javascript:window.top.space_addItem(4,5535,0,0,1,1,0); 色狼

javascript:window.top.space_addItem(4,1151,0,0,0,1,0); 老鹰

javascript:window.top.space_addItem(4,5837,0,0,1,1,0); 蜡笔小新

QQ空间免费标题栏代码：

javascript:window.top.space_addItem(19,44286,0,0,0,0,2); 爽爽夏日

javascript:window.top.space_addItem(19,39784,0,0,0,0,2); 桃心

javascript:window.top.space_addItem(19,39035,0,0,0,0,2); 粉色玫瑰

QQ空间免费漂浮代码：

注意：漂浮代码可能会遮住空间的链接，使用后注意调整好位置。

LOVE HOME

javascript:window.top.space_addItem(16,23212,330,80,600,600,0);

爱的故事

javascript:window.top.space_addItem(16,23214,330,80,600,600,0);

蝶影

javascript:window.top.space_addItem(16,23216,330,80,600,600,0);

love you

javascript:window.top.space_addItem(16,23226,330,80,600,600,0);

纯纯爱恋

javascript:window.top.space_addItem(16,23228,330,80,600,600,0);

冬夜息乐园

javascript:window.top.space_addItem(16,23230,330,80,600,600,0);

记忆心音

javascript:window.top.space_addItem(16,23232,330,80,600,600,0);

迷离蝴蝶

javascript:window.top.space_addItem(16,23234,330,80,600,600,0);

圣殿的烛光

javascript:window.top.space_addItem(16,23236,330,80,600,600,0);

悠扬芭蕾舞

javascript:window.top.space_addItem(16,23238,330,80,600,600,0);

我是公主

javascript:window.top.space_addItem(16,22097,50,80,250,250,0);

任性的我

javascript:window.top.space_addItem(16,22098,50,80,250,250,0);

会飞的人参果

javascript:window.top.space_addItem(16,22103,50,80,250,250,0);

心在飞

javascript:window.top.space_addItem(16,22105,50,80,250,250,0);

菊花台

javascript:window.top.space_addItem(16,22099,330,80,600,600,0);

浪漫满屋

javascript:window.top.space_addItem(16,22101,330,80,600,600,0);

奇幻花园

javascript:window.top.space_addItem(16,22103,330,80,600,600,0);

让爱做主

javascript:window.top.space_addItem(16,22105,330,80,600,600,0);

梦的希望

javascript:window.top.space_addItem(5,609,0,0,1,1,0); 有了

梦的希望 （彩色）

javascript:window.top.space_addItem(5,609,0,0,7,1,0); 有了

爱情天使 （单个）

javascript:window.top.space_addItem(5,1097,0,0,1,1,0);

爱情天使 （多个）

javascript:window.top.space_addItem(5,1097,0,0,4,1,0);

简单的叶子

javascript:window.top.space_addItem(5,609,0,0,1,1,0);

多彩的叶子

javascript:window.top.space_addItem(5,609,0,0,7,1,0);

qq空间边框代码(和上面代码一样的名字,但内容是不一样的! )

LOVE HOME

javascript:window.top.space_addItem(16,23211,330,80,600,600,0);

爱的故事

javascript:window.top.space_addItem(16,23213,330,80,600,600,0);

蝶影

javascript:window.top.space_addItem(16,23215,330,80,600,600,0);

love you

javascript:window.top.space_addItem(16,23227,330,80,600,600,0);

纯纯爱恋

javascript:window.top.space_addItem(16,23229,330,80,600,600,0);

冬夜息乐园

javascript:window.top.space_addItem(16,23231,330,80,600,600,0);

记忆心音

javascript:window.top.space_addItem(16,23233,330,80,600,600,0);

迷离蝴蝶

javascript:window.top.space_addItem(16,23235,330,80,600,600,0);

圣殿的烛光

javascript:window.top.space_addItem(16,23237,330,80,600,600,0);

悠扬芭蕾舞

javascript:window.top.space_addItem(16,23239,330,80,600,600,0);

爱的甜蜜蜜

javascript:window.top.space_addItem(16,21903,0,80,500,500,0);

爱你一生不变

javascript:window.top.space_addItem(16,21904,0,80,500,500,0);

爱情轨迹

javascript:window.top.space_addItem(16,21905,0,80,500,500,0);

爱情之旅

javascript:window.top.space_addItem(16,21906,0,80,650,650,0);

回味爱情

javascript:window.top.space_addItem(16,21907,0,80,500,500,0);

偏偏喜欢你

javascript:window.top.space_addItem(16,21908,0,80,500,500,0);

收获爱情

javascript:window.top.space_addItem(16,21909,0,80,500,500,0);

谢谢你的爱

javascript:window.top.space_addItem(16,21910,0,80,500,500,0);

有你真精彩

javascript:window.top.space_addItem(16,21911,0,80,500,500,0);

真的很想你

javascript:window.top.space_addItem(16,21912,0,80,500,500,0);

爱的甜蜜蜜

javascript:window.top.space_addItem(16,21903,0,80,500,500,0);

最新可用的小花藤代码：

太阳花

javascript:window.top.space_addItem(23,38542,-2,446,60,110,150);

矢车菊

javascript:window.top.space_addItem(23,38540,-2,446,60,110,150);

康乃馨

javascript:window.top.space_addItem(23,38538,-2,446,60,110,150);

百合花

javascript:window.top.space_addItem(23,38536,309,215,90,120,100);

最新小挂件代码：

1：心形装饰

javascript:window.top.space_addItem(16,23228,-290,-84,400,142,100);

2：圆：

javascript:window.top.space_addItem(16,23733,33,-177,60,249,0);

3：漂浮的彩色点

javascript:window.top.space_addItem(16,23734,350,80,100,100,0);

4：粉色雪花

javascript:window.top.space_addItem(16,23732,350,80,100,100,0);

5：橘色花朵

javascript:window.top.space_addItem(16,22099,300,80,500,50,0);

6：嫩黄色点

javascript:window.top.space_addItem(16,23212,350,80,500,50,0);

7：蓝色小点

javascript:window.top.space_addItem(16,23216,350,80,500,80,0);

8：超窄的心

javascript:window.top.space_addItem(16,23230,350,80,500,50,0);

9：一颗爱心

javascript:window.top.space_addItem(16,22106,300,80,52,210,0);

10：白色落雪

javascript:window.top.space_addItem(16,23699,330,80,100,100,0)

11：白色爱心

javascript:window.top.space_addItem(16,23233,235,-160,90,230,0);

12：j白色花花

javascript:window.top.space_addItem(16,23704,350,80,500,40,0);

13：绿叶子

javascript:window.top.space_addItem(16,23705,350,80,500,40,0);

14：飞心

javascript:window.top.space_addItem(16,21248,55,40,530,35,0);

15：爱心和蝴蝶

javascript:window.top.space_addItem(16,21247,55,40,530,35,0);

16：蓝色的心

javascript:window.top.space_addItem(16,21246,55,40,530,35,0);

17：粉红叶子

javascript:window.top.space_addItem(16,21245,55,40,530,35,0);

18：爱心和星星

javascript:window.top.space_addItem(16,21244,55,40,530,35,0);

19：蓝色蝴蝶

javascript:window.top.space_addItem(16,21243,55,40,530,35,0);

20：黄色的心

javascript:window.top.space_addItem(16,21242,55,40,530,35,0);

21：长着翅膀的心

javascript:window.top.space_addItem(16,21240,55,40,530,35,0);

22：气泡

javascript:window.top.space_addItem(16,21239,55,40,530,35,0);

23：类似闪光灯

javascript:window.top.space_addItem(16,21237,55,40,530,35,0);

24：飘点点

javascript:window.top.space_addItem(16,23214,300,250,400,40,0);

25：散发红点

javascript:window.top.space_addItem(16,23727,30,45,400,40,0);

26：彩色圆点

javascript:window.top.space_addItem(16,23734,30,45,400,40,0);

27：烟花

javascript:window.top.space_addItem(16,23737,30,45,400,40,0);

28：落流星

javascript:window.top.space_addItem(16,23725,30,45,600,160,0);

29：绿色小树蔓

javascript:window.top.space_addItem(16,21908,0,80,280,65,0);

30：一颗黄色爱心

javascript:window.top.space_addItem(16,21910,-100,-70,200,150,0);

31：土黄色圆

javascript:window.top.space_addItem(16,21903,-147,49,390,20,0);

32：爱心

javascript:window.top.space_addItem(16,23226,330,80,200,300,0);

33：一朵黄色花

javascript:window.top.space_addItem(16,23211,330,80,350,30,0);

34：冰蓝色的花

javascript:window.top.space_addItem(16,23213,0,-60,450,125,0);

淡粉色花朵：

javascript:window.top.space_addItem(16,23731,330,80,400,50,0);

粉色方块：

javascript:window.top.space_addItem(16,21904,0,80,400,25,0);

紫色带两闪星方块：

javascript:window.top.space_addItem(16,21911,0,80,400,25,0);

红色方块：

javascript:window.top.space_addItem(16,21912,0,80,400,25,0);

字（骄傲的我，任性的我）：

javascript:window.top.space_addItem(16,22098,820,-210,200,250,0);

花边：

javascript:window.top.space_addItem(16,22102,50,-198,318,240,0);

闪钻：

javascript:window.top.space_addItem(16,23730,350,80,320,30,0);

礼花：

javascript:window.top.space_addItem(16,23735,30,-198,90,300,0);

红色一闪一闪的小点：

javascript:window.top.space_addItem(16,23728,350,80,450,80,0);

英文 I trust and love you :

javascript:window.top.space_addItem(16,23227,330,80,355,275,80);

(移到右下角，只让它显示上面的)

彩虹圈：

javascript:window.top.space_addItem(16,21906,0,80,650,650,0);

另外，空间商城里有“免费装扮区”，物品会定期更新。

点空间右上角的“空间装扮”→上方“精品装饰”→“免费”，点击物即可试穿，调整好物品位置，点击空间右上角的“保存”。

Q4: JS 截取图片(img)标签中一块区域的内容转为base64编码

/**

* Convert an image

* to a base64 string

* @param {String} url

* @param {Function} callback

* @param {String} [outputFormat=image/png]

*/

function convertImgToBase64(url, callback, outputFormat){

var canvas = document.createElement('CANVAS'),

ctx = canvas.getContext('2d'),

img = new Image;

img.crossOrigin = 'Anonymous';

img.onload = function(){

var dataURL;

canvas.height = img.height;

canvas.width = img.width;

ctx.drawImage(img, 0, 0);

dataURL = canvas.toDataURL(outputFormat);

callback.call(this, dataURL);

canvas = null;

};

img.src = url;

}

这个方法试试吧！！！！