How to get an element in uniapp

Uniapp's method of obtaining a certain element: 1. Form verification, verify whether it is empty, the code is [if (this[`${x}`] == '') {return false}]; 2 , get the list of all required items, the code is [const query = uni.createSel].

The operating environment of this tutorial: windows7 system, uni-app2.5.1 version, Dell G3 computer.

uniapp's method of obtaining a certain element:

//表单验证
            from_judge() {
                if(this.get_must()){
                    for (let i = 0; i < this.model_list.length; i++) {
                        console.log(this.model_list[i])
                        if(this.model_list[i].dataset.must == &#39;2&#39;){
                            let x = this.model_list[i].dataset.model
                            console.log(this[`${x}`])
                            // if(){}
                            //验证是否为空
                            if (this[`${x}`] == &#39;&#39;) {
                                return false
                            }
                        }
                    }
                }
                return true
            },
            //获取所有必填项的列表
            get_must() {
                console.log("**************************------------------******************************")
                const query = uni.createSelectorQuery().in(this);
                query.selectAll(&#39;.must&#39;).fields({
                    dataset: true,
                }, data => {
                    this.model_list = data
                    console.log(data)
                }).exec();
                
                console.log("**************************------------------******************************")
                return true
            },

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