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通过画布实现共享的HTML5划痕效果示例
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本文主要通过画布实例介绍HTML5的划痕效果的实现，供大家参考使用。
当img.src改性，涂层也会自动适应新的图片大小。
修改图层功能更改图层样式
以下是HTML源代码（增加了移动设备支持）：
复制代码代码如下所示：
（功能（型号）{
bodystyle.mozuserselect =不关；
bodystyle.webkituserselect =不关；
VaR img =新的图像（）；
VaR的画布document.queryselector（'canvas）；
画布背景颜色= 'transparent。风格；
canvas.style.position =绝对的；
Img.addEventListener（负荷功能（e）{
VaR CTX；
无功W = img.width，
H = img.height；
无功offsetx = canvas.offsetleft，
offsety = canvas.offsettop；
Var MouseDown =假；
功能层（CTX）{
ctx.fillstyle = 'gray；
ctx.fillrect（0, 0，W，H）；
}
功能eventdown（e）{
E.preventDefault（）；
mousedown =真；
}
功能eventup（e）{
E.preventDefault（）；
mousedown = false；
}
功能eventmove（e）{
E.preventDefault（）；
如果（mousedown）{
如果（e.changedtouches）{
E = e.changedtouches { e.changedtouches length-1 }；
}
var = X（e.clientx + document.body.scrollleft e.pagex offsetx | | | |）- 0，
Y =（e.clienty + document.body.scrolltop e.pagey offsety | | | |）- 0；
用（CTX）{
BeginPath（）
弧（x，Y，5, 0，math.pi×2）；
填充（）；
}
}
}
画布宽度= W；
画布高度= h；
帆布风格。背景= 'url（+ IMG SRC +'。）；
CTX = canvas.getcontext（二维的）；
CTX fillStyle = 'transparent；
ctx.fillrect（0, 0，W，H）；
层（CTX）；
ctx.globalcompositeoperation = 'destination-out；
canvas.addeventlistener（'touchstart '，eventdown）；
canvas.addeventlistener（'touchend '，eventup）；
canvas.addeventlistener（'touchmove '，eventmove）；
canvas.addeventlistener（'mousedown '，eventdown）；
canvas.addeventlistener（'mouseup '，eventup）；
canvas.addeventlistener（'mousemove '，eventmove）；
}）；
img.src =数据：图像/格式；base64 ivborw0kgaaaansuheugaaakkaaaancayaaab0b2ihaaavnuleqvr4xu1ccxsuvzb + qplaulwpjqthr5bndkekgczkae1w7fmc0dazyzvthnszp9uzbu3wm924nnkg0rihunasldpqszd9dfyqvsagkurlsqislstsa6wyj / / / pdsv7kq0ql6o + gdefuo4flpp56 VV＋9693 / / / 3u，wpo5eb8xc1wavvaeafpbbw78auflbaharwif7wf4ic94lcovsa4somyuoateafpbb9f8qxgqrrhwavvgt5bwtnugvj g0oa2thw0bdkztaarhhgsgdsjinsranwwo1w8p9gfhy + zn6sbs7rb0c75 / / xthwht7 XW + oykbaywj8jsvhdsjesrlt9cq4xug9fjnq7gwhmipjfelbfrll6wdlq1tfnpb / / / p2ip fxr9cfmpahsk0ikwpm10sdtrrl2jx9qns博 / / vn9qgy + add6gg2clmie6lfg82o5f6eaiwmur8ghf1iocao2zd8ruvdw zgan6rx2x + cy9v6w + + + 2ubnkukhk9vr8bnxy6kn8oak8a68otxsrjqtazxphvo1ohx3tu40e09zo 1uththaizpblxhx05xupddc ruok5zzmuyofplacbjyhx1nm1fqt6c2dkkaqw1toggpsymymg7f4kts80iyuhhkyngrelhfxaixy1x4cyqtxvjccaufnkjgb / / bwozr45az8z6ohvxlvp7fr32fq7uagkuuv12pj5z5k + 3xwtxisco14j 5jpa2dhykhxvviswm / grpx8j496bmbvo5lwpcu9 + L + ubyq8f0sxj1fibuvwerrq9bxkjx7uak1ovgp7tbes11ynseecuavfjt + yalyrxsi0 / / qjptd9u5ek2nzlz 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}（文档，正文，样式）；
的eventup事件处理函数需要判断如果代码此代码替换时，代码完成：
复制代码代码如下所示：
E.preventDefault（）；
mousedown = false；
VaR数据= ctx.getimagedata（0,0，w，h）数据；
对于（var i = 0，J = 0；i < data.length；我+ = 4）{
如果（数据{数据{ i + 1 }，数据{ i + 2 }，数据{ i + 3 }）{
++；
}
}
如果（j = w * h * 0.1）{
警报（好的）；
}
0.1的代码是10%。当涂层面积小于10%时，窗口就会弹出，这意味着可以根据需要进行调整。
当img.src改性，涂层也会自动适应新的图片大小。
修改图层功能更改图层样式
以下是HTML源代码（增加了移动设备支持）：
复制代码代码如下所示：
（功能（型号）{
bodystyle.mozuserselect =不关；
bodystyle.webkituserselect =不关；
VaR img =新的图像（）；
VaR的画布document.queryselector（'canvas）；
画布背景颜色= 'transparent。风格；
canvas.style.position =绝对的；
Img.addEventListener（负荷功能（e）{
VaR CTX；
无功W = img.width，
H = img.height；
无功offsetx = canvas.offsetleft，
offsety = canvas.offsettop；
Var MouseDown =假；
功能层（CTX）{
ctx.fillstyle = 'gray；
ctx.fillrect（0, 0，W，H）；
}
功能eventdown（e）{
E.preventDefault（）；
mousedown =真；
}
功能eventup（e）{
E.preventDefault（）；
mousedown = false；
}
功能eventmove（e）{
E.preventDefault（）；
如果（mousedown）{
如果（e.changedtouches）{
E = e.changedtouches { e.changedtouches length-1 }；
}
var = X（e.clientx + document.body.scrollleft e.pagex offsetx | | | |）- 0，
Y =（e.clienty + document.body.scrolltop e.pagey offsety | | | |）- 0；
用（CTX）{
BeginPath（）
弧（x，Y，5, 0，math.pi×2）；
填充（）；
}
}
}
画布宽度= W；
画布高度= h；
帆布风格。背景= 'url（+ IMG SRC +'。）；
CTX = canvas.getcontext（二维的）；
CTX fillStyle = 'transparent；
ctx.fillrect（0, 0，W，H）；
层（CTX）；
ctx.globalcompositeoperation = 'destination-out；
canvas.addeventlistener（'touchstart '，eventdown）；
canvas.addeventlistener（'touchend '，eventup）；
canvas.addeventlistener（'touchmove '，eventmove）；
canvas.addeventlistener（'mousedown '，eventdown）；
canvas.addeventlistener（'mouseup '，eventup）；
canvas.addeventlistener（'mousemove '，eventmove）；
}）；
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}（文档，正文，样式）；
的eventup事件处理函数需要判断如果代码此代码替换时，代码完成：
复制代码代码如下所示：
E.preventDefault（）；
mousedown = false；
VaR数据= ctx.getimagedata（0,0，w，h）数据；
对于（var i = 0，J = 0；i < data.length；我+ = 4）{
如果（数据{数据{ i + 1 }，数据{ i + 2 }，数据{ i + 3 }）{
++；
}
}
如果（j = w * h * 0.1）{
警报（好的）；
}
0.1的代码是10%。当涂层面积小于10%时，窗口就会弹出，这意味着可以根据需要进行调整。
声明：本文内容用于数码产品信息整理与选购参考，具体价格、库存、售后政策以官方渠道和电商页面实时信息为准。