代码
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<canvas id="test" width="200" height="200">您的浏览器不支持canvas</canvas>
<script>
var canvas_2=document.getElementById("test");
var can2_context=canvas_2.getContext("2d");
var SHADOW_COLOR='rgba(0,0,0,0.7)'
can2_context.shadowColor=SHADOW_COLOR;
can2_context.shadowOffsetX=3;
can2_context.shadowOffsetY=3;
can2_context.shadowBlur=5
can2_context.fillStyle="red"
can2_context.fillRect(0,0,100,100)
</script>
运行结果