如何比较两个颜色的相似程度？

比如有两个颜色,如果是16进制的颜色值

var str1 = "#aabbcc";

var reg1 = /(\w{1,2})/g;

var rs1 = str1.match(reg1);

var r1 = parseInt("0x"+rs1[0]);

var g1 = parseInt("0x"+rs1[1]);

var b1 = parseInt("0x"+rs1[2]);

var str2= "#aabbcc";

var reg2 = /(\w{1,2})/g;

var rs2 = str2.match(reg2);

var r2 = parseInt("0x"+rs2[0]);

var g2 = parseInt("0x"+rs2[1]);

var b2 = parseInt("0x"+rs2[2]);

然后对于两个颜色，可以使用距离 Math.sqrt( (r1-r2) *(r1-r2) +(g1-g2)*(g1-g2)+(b1-b2)*(b1-b2) )进行比较， 距离近则相似。 

转载于:https://juejin.im/post/5b63c841f265da0f716c3f05