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Javascript实现颜色rgb与16进制转换的方法

2015-04-18 10:23 1051 查看

本文实例讲述了Javascript实现颜色rgb与16进制转换的方法。分享给大家供大家参考。具体如下：

使用方法：

Color(12,34,56);
Color("#fff")
Color("#defdcd")

实现代码：

//颜色转换
var Color = function() {
if (!(this instanceof Color)) {
var color = new Color();
color._init.apply(color, arguments);
return color;
}
if (arguments.length) {
this._init.apply(this, arguments);
}
}
//设置get，set方法
var methods = ["red", "green", "blue", "colorValue"];
var defineSetGetMethod = function(fn, methods) {
var fnPrototype = fn.prototype;
for (var i = 0; i < methods.length; i++) {
var methodName = methods[i].charAt(0).toLocaleUpperCase() + methods[i].substring(1);
fn.prototype['set' + methodName] = new Function("value", "this." + methods[i] + "= value;");
fn.prototype['get' + methodName] = new Function("return this." + methods[i] + ";");
fn.prototype['toString'] = new Function('return "rgb("+this.red+","+this.green+","+this.blue+")";');
}
};
defineSetGetMethod(Color, methods);
//扩展函数的实例方法
var extend = function(fn, option) {
var fnPrototype = fn.prototype;
for (var i in option) {
fnPrototype[i] = option[i];
}
};
extend(Color, {
_init : function() {
if (arguments.length == 3) {
this.red = arguments[0];
this.green = arguments[1];
this.blue = arguments[2];
this.getColorValue();
} else {
var colorValue = arguments[0].replace(/^\#{1}/, "");
if (colorValue.length == 3) {
colorValue = colorValue.replace(/(.)/g, '$1$1');
}
this.red = parseInt('0x' + colorValue.substring(0, 2), 16);
this.green = parseInt('0x' + colorValue.substring(2, 4), 16);
this.blue = parseInt('0x' + colorValue.substring(4), 16);
this.colorValue = "#" + colorValue;
}
},
getColorValue : function() {
if (this.colorValue) {
return this.colorValue;
}
var hR = this.red.toString(16);
var hG = this.green.toString(16);
var hB = this.blue.toString(16);
return this.colorValue = "#" + (this.red < 16 ? ("0" + hR) : hR) + (this.green < 16 ? ("0" + hG) : hG) + (this.blue < 16 ? ("0" + hB) : hB);
}
});

希望本文所述对大家的javascript程序设计有所帮助。

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标签： Javascript 颜色转换

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