watch有个immediate =true 选项
解决 vue首次赋值不触发watch

        watch: {
            viewWidget(val){
                if (val !== this.form.scene) {
                    this.form.scene = val;
                }

            },
            version(val) {
                this.loadData();
            },
            "treeCheckIdVersion":{
                immediate: true,
                handler(newVal, oldVal){
                    // console.log("这是前面传来的 props 值: " + newVal + ",原来的值是: " + oldVal);
                    this.initParentInput(this.parentId);
                }
            }
        },