javascript - 函数内的 setTimeout 失败

Question

该函数接受一个参数whichImage。这是我们正在使用的图像的 HTMLImageElement 对象。图像宽度将减半，3秒后将恢复正常宽度。但是，应该在 3 秒后执行的 setTimeout 代码失败，并显示错误消息whichImage is not Defined。我需要纠正什么才能使该功能正常工作？

function resizeImageFunction(whichImage){
    // Get the width of the image
    alert(whichImage);
    var width = whichImage.width;
    var halfwidth = Math.round(width/2);
    whichImage.width=halfwidth;
    setTimeout("whichImage.width=width;",3000);
}

Answer 1

function resizeImageFunction(whichImage){
    // Get the width of the image
    alert(whichImage);
    var width = whichImage.width;
    var halfwidth = Math.round(width/2);
    whichImage.width=halfwidth;

    setTimeout(function(){
        whichImage.width=width;
    },3000);
}