摘集

黑客帝国刷码 情节：

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<canvas id="matrix"></canvas> <script type="text/javascript">       //文字     var txts = "0123456789!@#$%^&*()~_+℃☆○※";     //转为数组     txts = txts.split("");     var matrix=document.getElementById("matrix");     var context=matrix.getContext("2d");     matrix.height=window.innerHeight;     matrix.width=window.innerWidth;     var drop=[];     var font_size=16;     var columns=matrix.width/font_size;     for(var i=0;i<columns;i++)         drop[i]=1;       function drawMatrix(){           context.fillStyle="rgba(0, 0, 0, 0.09)";         context.fillRect(0,0,matrix.width,matrix.height);             context.fillStyle="green";         context.font=font_size+"px";         for(var i=0;i<columns;i++){             //随机取要输出的文字             var text = txts[Math.floor(Math.random()*txts.length)];             //输出文字，注意坐标的计算             context.fillText(text,i*font_size,drop[i]*font_size);/*get 0 and 1*/               if(drop[i]*font_size>(matrix.height*2/3)&&Math.random()>0.95)/*reset*/                 drop[i]=0;             drop[i]++;         }     }     setInterval(drawMatrix,33); </script>