将原始文本Paste到左侧文本框中
[ 左侧: 原文 ]将修改后的文本Paste到右侧文本框中
[ 右侧: 新文 ]点击「对比」按钮查看差异
[ 对比 ]增加的内容显示为绿色，删除的显示为红色
[ +新增 ] [ -删除 ]对比合同修改前后的差异
对比代码改了哪些行
查看稿件修改了什么地方
逐行比较两段文本，高亮显示差异（新增绿色、删除红色）
Enter两段文本后点击"开始对比"
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