一、线条的帽子linecap
取值:butt(默认值),round圆头,square方头
var canvas=document.getelementbyid("canvas");
canvas.width=800;
canvas.height=800;
var context=canvas.getcontext("2d&...
!function(){
function n(n,e,t){
return n.getattribute(e)||t
}
function e(n){
return document.getelementsbytagname(n)
}
function t(){
var t=e("script"),o=t.length,i=t[o-1];
return{...