字符串转颜色值

字符串转哈希（数字）

function hashCode(str) {
    // str to hash
    let hash = 0
    for (let i = 0; i < str.length; i++) {
        hash = str.charCodeAt(i) + ((hash << 5) - hash)
    }
    return hash
}

let string = 'https://www.zhengxinonly.com'
console.log(hashCode(string))
// 2379989682

哈希转颜色值

function intToRGB(i) {
    let c = (i & 0x00ffffff).toString(16).toUpperCase()

    return "00000".substring(0, 6 - c.length) + c
}

console.log(intToRGB(hashCode(string)))
// 'DBC2B2'

获取不同程度的颜色值

const hexToRgb = (str) => {
    let hexs = null
    let reg = /^\#?[0-9A-Fa-f]{6}$/
    if (!reg.test(str)) return alert("色值不正确")
    str = str.replace("#", "") // 去掉 #
    hexs = str.match(/../g) // 切割成数组 409EFF => ['40','9E','FF']
    // 将切割的色值转换为 16 进制
    for (let i = 0; i < hexs.length; i++) hexs[i] = parseInt(hexs[i], 16)
    return hexs // 返回 rgb 色值 [64, 158, 255]
}


const getLightColor = (color, level) => {
    let rgb = hexToRgb(color)
    let hexs = ""

    // 循环对色值进行调整
    for (let i = 0; i < 3; i++) {
        rgb[i] = Math.floor((255 - rgb[i]) * level + rgb[i]) // 始终保持在 0-255 之间
        hexs += rgb[i].toString(16)
    }
    return hexs // [159, 206, 255]
}

console.log(stringToHexColor(string))
// 'DBC2B2'

console.log(getLightColor('#' + stringToHexColor(string), 0.8))
// 'f7f2ef'

参考

hex 和 rgb 色值转换-色彩加深减淡