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BASE64 codes always start with the form data:image/xxx;base64,xxxxxx..., so just write a regular expression and test src

$('img').each((i,item)=>{
    let src = item.src
    if(src.indexOf('data:image/jpg;base64,')>-1){
        // base64 圖片操作
    }else{
        //path 圖片操作
    }
})

Are non-base64 images all URL addresses?

Just match according to the beginning of src

$('img').each((i,item)=>{
    let src = item.src
    if(src.indexOf('data:image')>-1){
        // base64 圖片操作
    }else{
        //path 圖片操作
    }
})

You need to use startWith, which is more efficient:

$('img').each((i,item)=>{
    let src = item.src
    if(src.startWith('data:image')){
        // base64 圖片操作
    }else{
        //path 圖片操作
    }
})

function validDataUrl(s) {
    return validDataUrl.regex.test(s);
}
validDataUrl.regex = /^\s*data:([a-z]+\/[a-z0-9-+.]+(;[a-z-]+=[a-z0-9-]+)?)?(;base64)?,([a-z0-9!$&',()*+;=\-._~:@\/?%\s]*?)\s*$/i;

module.exports = validDataUrl;