HTML5 canvas基本绘图之填充样式实现

var canvas = document.getElementById("canvas");   

        var context = canvas.getContext("2d");   

      

        //线性渐变   

        var grd = context.createLinearGradient( 10 , 10, 100 , 350 );   

        grd.addColorStop(0,"#1EF9F7");   

        grd.addColorStop(0.25,"#FC0F31");   

        grd.addColorStop(0.5,"#ECF811");   

        grd.addColorStop(0.75,"#2F0AF1");   

        grd.addColorStop(1,"#160303");   

        context.fillStyle = grd;   

        context.fillRect(10,10,100,350);   

      

        //径向渐变   

        var grd = context.createRadialGradient(325 , 200, 0 , 325 , 200 , 200 );   

        grd.addColorStop(0,"#1EF9F7");   

        grd.addColorStop(0.25,"#FC0F31");   

        grd.addColorStop(0.5,"#ECF811");   

        grd.addColorStop(0.75,"#2F0AF1");   

        grd.addColorStop(1,"#160303");   

        context.fillStyle = grd;   

        context.fillRect(150,10,350,350);   

      

        //位图填充   

        var bgimg = new Image();   

        bgimg.src = "background.jpg";   

        bgimg.onload=function(){   

            var pattern = context.createPattern(bgimg, "repeat");   

            context.fillStyle = pattern;   

            context.strokeStyle="#F20B0B";   

            context.fillRect(600, 100, 200,200);   

            context.strokeRect(600, 100, 200,200);   

        };