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特别鸣谢:无极玄天、幽梦子曦

Box3Entity.prototype.setForceRun=function(mode=true){
    if (!this.isPlayer) return this.notPlayerError();
    if (mode) {
        Object.defineProperty(this.player, "walkSpeed", {
            get() {
                return this.runSpeed;
            }
        });
    } else {
        Object.defineProperty(this.player, "walkSpeed", {
            value: 0.22
        });
    }
    this.enableForceRun = mode;
}

说明:一个参数mode，布尔值，true是开启 false是关闭

Box3Entity.prototype.enableForceRun是个布尔值，与mode相同