前端VUE，axios返回值有延迟

      showBp(bp) {
        this.getBpJson(bp);
        console.log(this.bpJson);
        // this.bp2tree(this.bpJson);
      },

      getBpJson(bp) {
        var that = this;
        this.$post('/flow/bp/bpJson',bp).then((resp) => {
          that.bpJson = resp.data;
        });
      },

打印为null，但是过会打印就有结果了

异步请求肯定没同步快啊，axios异步的。你应该把打印或者需要用到bpJson的代码写到then()里边

      showBp(bp) {
        this.getBpJson(bp);
      },
      getBpJson(bp) {
        var that = this;
        this.$post('/flow/bp/bpJson',bp).then((resp) => {
            that.bpJson = resp.data;
            console.log(that.bpJson);
            // that.bp2tree(that.bpJson);
        });
      },

getBpJson要用回调函数接收后台返回的数据。

axios是异步的他又then方法和catch方法