应用背景 var canvas=document.getElementById("demo");
var cxt=canvas.getContext("2d");
var flag=0;
canvas.onmousedown=function(evt){
evt=window.event?window.event:evt;
var startX=evt.pageX-this.offsetLeft;
var startY=evt.pageY-this.offsetTop;
cxt.beginPath();
cxt.moveTo(startX,startY);
flag=1;
}
//鼠标移动 （获取鼠标位置）
canvas.onmousemove=function(){
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001182s ]
SELECT `a`.`aid`,`a`.`title`,`a`.`create_time`,`m`.`username` FROM `jrk_downrecords` `a` INNER JOIN `jrk_member` `m` ON `a`.`uid`=`m`.`id` WHERE `a`.`status` = 1 GROUP BY `a`.`aid` ORDER BY `a`.`create_time` DESC LIMIT 10 [ RunTime:0.075435s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001079s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001205s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.000985s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003214s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000860s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003946s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.022834s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001812s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 80432 [ RunTime:0.019977s ]
