js随机颜色

这两步首先生成随机颜色

//随机生成50个颜色var a = 0, b = 0, c = 0;var arr = [];for (var i = 0; i < 50; i++) {    arr[i] = rc();}function rc() {    var r = Math.floor(Math.random() * 156);    var g = Math.floor(Math.random() * 156);    var b = Math.floor(Math.random() * 156);    return `rgb(${r},${g},${b})`;}

调用（类似）把变色的id放到arr[ ]里

var id = position;                var t = $("#foodShow b:contains(" + id + ")").map(function () {                    if ($(this).text() == id) {                        return this;                    }                });                t.css("background", arr[id]);