【备忘】按给定几率进行随机抽取

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function StringResource(k) { return StringResource[k] || k; } function RandomSelector() {   var f = 0, c = [];     return function (v, r) {     if (arguments.length) {       if (r <= 0) throw { message: StringResource("INVALID_ARGUMENT") };       c.push([r, v]);       f += r;     } else {       var i = 0; r = Math.random() * f;       for (; ; ) if ((r -= (v = c[i++])[0]) < 0) return v[1];     }   }; }

没啥技术含量的随机抽取