输入示例：

• -webkit-linear-gradient(90deg,#3caba7,#92dffc)
• linear-gradient(90deg,#3caba7,#92dffc)
• linear-gradient(to right, rgb(18, 194, 233), rgb(196, 113, 237), rgb(246, 79, 89))
• linear-gradient(to bottom, #12c2e9, #c471ed, #f64f59)
• rgb(18, 194, 233), rgb(196, 113, 237), rgb(246, 79, 89)
• #12c2e9, #c471ed, #f64f59
• background-color: #FFFFFF; background-image: linear-gradient(180deg, #FFFFFF 0%, #6284FF 50%, #FF0000 100%);