Clipic.js插件可以为移动端 (仅支持移动端) 提供头像上传并裁剪成指定尺寸，用原生js开发的，轻量级，包含html跟css，不到8kb。点此链接体验： https://teojs.github.io/clipic/
https://github.com/teojs/clipic
参数说明
width:Number (默认：500) – 裁剪宽度
height:Number (默认：500) – 裁剪高度
ratio:Number (可选) – 裁剪的比例，当传入ratio时width/height将无效
src:String (必传) – 需要裁剪的图片，可以是图片链接，或者 base64
type:String (默认：jpeg) – 裁剪后图片的类型，仅支持 jpeg/png 两种
quality:Number (默认：0.9) – 压缩质量
buttonText:Array (默认：[‘取消’, ‘重置’, ‘完成’]) – 底部三个按钮文本
http://bbs.itying.com/topic/5cb17892c6a71b10bcef96b0
http://love21cn.msn.com.cn的图片上传功能后可以实现区域截图,也可以实现放大缩小...估计是用了JS来实现的:var div_move = 0
var IE = document.all?true:false
var tempX,tempY,oldX,oldY
var have_move = 0
function grasp()
{
div_move = 1
if(IE)
{
document.getElementById("source_div").setCapture()
}
}
function free()
{
div_move = 0
have_move = 0
document.getElementById("source_div").releaseCapture()
}
function getMouseXY(e)
{
if (IE)
{ // grab the x-y pos.s if browser is IE
tempX = event.clientX + document.body.scrollLeft
tempY = event.clientY + document.body.scrollTop
}
else
{
// grab the x-y pos.s if browser is NS
tempX = e.pageX
tempY = e.pageY
}
// catch possible negative values in NS4
if (tempX <0){tempX = 0}
if (tempY <0){tempY = 0}
}
function move_it(e)
{
getMouseXY(e)
if(div_move == 1)
{
if(have_move == 0)
{
//alert('a')
oldX = tempX
oldY = tempY
have_move = 1
}
var left = parseInt(document.getElementById("source_div").style.left)
var top = parseInt(document.getElementById("source_div").style.top)
//alert(top)
//alert(left)
//alert(tempX)
//alert(oldX)
document.getElementById("source_div").style.left = left + tempX - oldX
document.getElementById("source_div").style.top = top + tempY - oldY
oldX = tempX
oldY = tempY
}
}
function change_size(method)
{
if(method == 1)
{
var per = 1.25
}
else
{
var per = 0.8
}
document.getElementById("show_img").width = document.getElementById("show_img").width*per
//document.getElementById("show_img").height = document.getElementById("show_img").height*per
}
function micro_move(method)
{
switch (method)
{
case "up":
var top = parseInt(document.getElementById("source_div").style.top)
document.getElementById("source_div").style.top = top - 5
break
case "down":
var top = parseInt(document.getElementById("source_div").style.top)
document.getElementById("source_div").style.top = top + 5
break
case "left":
var left = parseInt(document.getElementById("source_div").style.left)
document.getElementById("source_div").style.left = left - 5
break
case "right":
var left = parseInt(document.getElementById("source_div").style.left)
document.getElementById("source_div").style.left = left + 5
break
}
}
function turn(method)
{
var i=document.getElementById('show_img').style.filter.match(/\d/)[0]
//alert(i)
i=parseInt(i)+parseInt(method)
//alert(i)
if(i<0)
{
i += 4
}
if(i>=4)
{
i -= 4
}
//alert(i)
document.getElementById('show_img').style.filter='progid:DXImageTransform.Microsoft.BasicImage(Rotation='+i+')'
}
function mysub()
{
var Oform = document.myform
Oform.go.value = 1
Oform.width.value = document.getElementById("show_img").width
Oform.left.value = document.getElementById("source_div").style.left
Oform.top.value = document.getElementById("source_div").style.top
if(IE)
{
Oform.turn.value = document.getElementById('show_img').style.filter.match(/\d/)[0]
}
Oform.submit()
}
苹果树下也有类似功能不过,功能要比你所说的强大的多...
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