如何修改字符串html中img src里面的属性值?

利用dom的属性结构

    let html = '<div>测试案例文本<img src="1.jpg"/></div>'
    let frag = document.createElement('div')
    frag.innerHTML = html
    let arrImg = frag.querySelectorAll('img')
    for(let i = 0; i < arrImage.length; i++) {
        arrImage[i].src = arrImage[i].src + '?.....'
    }
    let newStrHtml = frag.innerHTML
    frag = null