How to get vue instance this? in vue methods

handleScroll: throttle(
        function () {
        let Dom = document.querySelector("-sharpbusinessSummary");
        console.log(Dom.scrollTop);
        console.log(this)
    },500
),
        
        1.thisundefined
        2.
        
       ```
        handleScroll: throttle(
                () => {
                let Dom = document.querySelector("-sharpbusinessSummary");
                console.log(Dom.scrollTop);
                console.log(this)
            },500
        ), 
        ```           
        
         `this`  **** 
        `{a:{data:fn,methods:xxx}}`
        
Mar.05,2022

if you write it yourself, use call or apply to deal with this
example:

handleScroll: throttle(function(){
        let Dom = document.querySelector('-sharpbusinessSummary');
        console.log(Dom.scrollTop);
        console.log(this)
    }.bind(this),500), 
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