javascript - colorpicker颜色对照
迷茫
迷茫 2017-04-11 11:41:35

rgb(255, 255, 0)跟#FFFF00都是表示同一种颜色,这两种表示之间怎么转换的?

迷茫
迷茫

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reply all(3)
大家讲道理

先转化为数组,再转化为想要的格式,提供如下代码供参考,最近刚修改的,新增了对透明度的支持

var toArray = function(value) {
    if (/^#[A-Za-z0-9]{3}$/.test(value)) {
        value = value.replace(/#/, "");
        var arr = [];
        arr[0] = parseInt(value.substr(0, 1) + value.substr(0, 1), 16);
        arr[1] = parseInt(value.substr(1, 1) + value.substr(1, 1), 16);
        arr[2] = parseInt(value.substr(2, 1) + value.substr(2, 1), 16);
        arr[3] = 1;
        return arr;
    }
    if (/^#[A-Za-z0-9]{6}$/.test(value)) {
        value = value.replace(/#/, "");
        var arr = [];
        arr[0] = parseInt(value.substr(0, 2), 16);
        arr[1] = parseInt(value.substr(2, 2), 16);
        arr[2] = parseInt(value.substr(4, 2), 16);
        arr[3] = parseInt(1);
        return arr;
    }
    if (/^#[A-Za-z0-9]{8}$/.test(value)) {
        value = value.replace(/#/, "");
        var arr = [];
        arr[0] = parseInt(value.substr(2, 2), 16);
        arr[1] = parseInt(value.substr(4, 2), 16);
        arr[2] = parseInt(value.substr(6, 2), 16);
        arr[3] = parseInt(value.substr(0, 2), 16) / 255;
        return arr;
    }
    if (/^rgb\([0-9,\.\s]+\)$/.test(value)) {
        var arr = value.replace(/(rgb\(|\))/gi, "").split(/,\s*/);
        arr[0] = parseInt(arr[0]);
        arr[1] = parseInt(arr[1]);
        arr[2] = parseInt(arr[2]);
        arr[3] = 1;
        return arr;
    }
    if (/^rgba\([0-9,\.\s]+\)$/.test(value)) {
        var arr = value.replace(/(rgb\(|\))/gi, "").split(/,\s*/);
        arr[0] = parseInt(arr[0]);
        arr[1] = parseInt(arr[1]);
        arr[2] = parseInt(arr[2]);
        arr[3] = parseInt(arr[3]);
        return arr;
    }
    return null;
},

toHex = function(num) {
    var hex;
    num = (num >= 0 && num <= 255) ? num: 0;
    hex = num.toString(16);
    return hex.length === 2 ? hex: '0' + hex;
},

toValue = {
    rgb: function(arr) {
        return 'rgb(' + arr[0] + ',' + arr[1] + ',' + arr[2] + ')';
    },
    rgba: function(arr) {
        return 'rgb(' + arr[0] + ',' + arr[1] + ',' + arr[2] + ',' + arr[3] + ')';
    },
    hex6: function(arr) {
        return '#' + toHex(arr[0]) + toHex(arr[1]) + toHex(arr[2]);
    },
    hex8: function(arr) {
        return '#' + toHex(arr[0]) + toHex(arr[1]) + toHex(arr[2]) + toHex(arr[3] * 255);
    }
};

正则写得不严谨,也不简洁,只能以后再折腾了。

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