怎么在HTML5中使用Canvas实现一个写字板功能-创新互联

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具体代码如下：

    
    
    
    
        body,html {
            padding: 0;
            margin: 0;
        }
        a,div,span {
            font-family: "Arial","Microsoft YaHei","黑体","宋体",sans-serif;
        }
        .canvas-box {
            display: block;
            margin: 40px auto;
            background: #f5f5f5;
        }
        .color-box {
            width: 1080px;
            display: block;
            margin: 20px auto;
            text-align: center;
        }
        .color-item {
            display: inline-block;
            vertical-align: middle;
            width: 48px;
            height: 24px;
            margin: 10px;
            background: #989898;
            cursor: pointer;
        }
        .red {
            background: #e01d5b;
        }
        .blue {
            background: #1d6ae0;
        }
        .green {
            background: #1de087;
        }
        .yellow {
            background: #f3e41d;
        }
        .orange {
            background: #f9850b;
        }
        .black {
            background: #333;
        }
        .color-item.active {
            border: solid 3px #565656;
        }
        .btn {
            display: block;
            width: 120px;
            height: 40px;
            line-height: 40px;
            margin: 10px auto;
            text-align: center;
            font-size: 18px;
            border: solid 1px #999;
            border-radius: 5px;
            cursor: pointer;
        }