| 本文实例为大家分享了js实现图片切割的具体代码，供大家参考，具体内容如下 
代码： <!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title> <style> .cube{ height: 0; width: 0; position: absolute; left: 0; top:0; box-sizing: border-box; background-color: lightseagreen; opacity: .3; z-index: 99;pointer-events: none; } #big{ border: 1px solid black; height: 500px; width: 500px; position: relative; background-image: url("img/pixel.png"); line-height: 500px; overflow: hidden; vertical-align: middle; text-align: center; float: left; } #big>img{line-height: 500px; vertical-align: middle; max-height: 100%; max-width: 100%; pointer-events: none; } .cv{ position: relative; float: left; border: 2px solid lightseagreen; } </style> <script> let count=0;let c,b,d,p1,p2,cv,cx,img,p; window.onload=function (){ c=document.querySelectorAll(".cube"); b=document.getElementById("big"); cv=document.getElementById("c"); cx=cv.getContext('2d'); img=new Image(); d=b.querySelector("img"); img.src=d.src; img.onload=function(){ cx.drawImage(img, 0,0,500,500,0,0,500,500); p=img.width/b.querySelector("img").width; console.log(img); } p1={ x:0, y:0 }; p2={ x:0, y:0 }; b.addEventListener("click",function (e){ count++; if(count===1){ p1.x=e .offsetX; p1.y=e.offsetY; p2.x=e .offsetX; p2.y=e.offsetY; f2(); f4(); } if(count===2){ p2.x=e.offsetX; p2.y=e.offsetY; myDraw(); } }); function f1(){ c[0].style.height=p2.y+"px"; c[1].style.height=p2.y+"px"; c[2].style.height=p2.y+"px"; c[3].style.top=p2.y+"px"; c[4].style.top=p2.y+"px"; c[3].style.height=(p1.y-p2.y)+"px"; c[4].style.height=(p1.y-p2.y)+"px"; c[5].style.top=p1.y+"px"; c[6].style.top=p1.y+"px"; c[5].style.height=(b.offsetHeight-p1.y)+"px"; c[6].style.height=b.offsetHeight-p1.y+"px"; c[7].style.top=p1.y+"px"; c[7].style.height=(b.offsetHeight-p1.y)+"px"; } function f2(){ c[0].style.height=p1.y+"px"; c[1].style.height=p1.y+"px"; c[2].style.height=p1.y+"px"; c[3].style.top=p1.y+"px"; c[4].style.top=p1.y+"px"; c[3].style.height=(p2.y-p1.y)+"px"; c[4].style.height=(p2.y-p1.y)+"px"; c[5].style.top=p2.y+"px"; c[6].style.top=p2.y+"px"; c[5].style.height=(b.offsetHeight-p2.y)+"px"; c[6].style.height=b.offsetHeight-p2.y+"px"; c[7].style.top=p2.y+"px"; c[7].style.height=(b.offsetHeight-p2.y)+"px"; } function f3(){ c[0].style.width=p2.x+"px"; c[1].style.left=p2.x+"px"; c[1].style.width=(p1.x-p2.x)+"px"; c[2].style.left=p1.x+"px"; c[2].style.width=(b.offsetWidth-p1.x)+"px"; c[3].style.width=p2.x+"px"; c[4].style.left=p1.x+"px"; c[4].style.width=(b.offsetWidth-p2.x)+"px"; c[5].style.width=p2.x+"px"; c[6].style.left=p2.x+"px"; c[6].style.width=(p1.x-p2.x)+"px"; c[7].style.left=p1.x+"px"; c[7].style.width=(b.offsetWidth-p1.x)+"px"; } function f4(){ c[0].style.width=p1.x+"px"; c[1].style.left=p1.x+"px"; c[1].style.width=(p2.x-p1.x)+"px"; c[2].style.left=p2.x+"px"; c[2].style.width=(b.offsetWidth-p2.x)+"px"; c[3].style.width=p1.x+"px"; c[4].style.left=p2.x+"px"; c[4].style.width=(b.offsetWidth-p2.x)+"px"; c[5].style.width=p1.x+"px"; c[6].style.left=p1.x+"px"; c[6].style.width=(p2.x-p1.x)+"px"; c[7].style.left=p2.x+"px"; c[7].style.width=(b.offsetWidth-p2.x)+"px"; } b.addEventListener("mousemove",function (e){ if(count===1){ p2.x=e.offsetX; p2.y=e.offsetY; if(p2.y<p1.y){ f1(); }else{ f2(); } if(p2.x<p1.x){ f3(); }else{ f4(); } } }) } function myDraw(){ cx.clearRect(0,0,500,500); let w=p1.x-p2.x; if(w<0){ w=-w; } w*=p; let h=p1.y-p2.y; if(h<0){ h=-h; } h*=p; if(p1.x<p2.x){ p1.x=(p1.x-b.querySelector("img").offsetLeft)*p; }else{ p1.x=(p2.x-b.querySelector("img").offsetLeft)*p; } if(p1.y<p2.y){ p1.y=(p1.y-b.querySelector("img").offsetTop)*p; }else{ p1.y=(p2.y-b.querySelector("img").offsetTop)*p; } cx.drawImage(img, p1.x,p1.y, w,h,0,0,500,500); p1.x=0; p1.y=0; p2.x=0; p2.y=0; } </script> </head><body > <divid="big"> <!-- 8个div覆盖--> <div class="cube"></div> <div class="cube"></div> <div class="cube"></div> <div class="cube"></div> <div class="cube"></div> <div class="cube"></div> <div class="cube"></div> <div class="cube"></div> <img src="img/katy2.jpg" alt=""/></div><div class="cv"> <canvas id="c" height="500" width="500"> </canvas></div></body></html>以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持wanshiok.com。
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