复制代码代码如下: <head> <script src='jquery-1.9.1.js'></script> <script src='jcanvas.min.js'></script> <!--<script src='js/jquery.mobile-1.2.0.min.js'></script> --> <script> var maxX=-1; var maxY=-1; var minX=99999; var minY=99999; function checkData(event){ var x=event.pageX-$('canvas').offset().left; var y=event.pageY-$('canvas').offset().top; if(x>maxX){ maxX=x; }else if(x<minX){ minX=x; } if(y>maxY){ maxY=y; }else if(y<minY){ minY=y; } } $(function(){ var obj=$('canvas'); var temp_e; var temp_draw=false;