Question

我需要调整图片的自然大小以适应屏幕，就像Chrome在其中打开图像一样，我为此目的编写了rescale(）函数（下图）。

它的工作效果很好但适用于大型横向图像（在使用我的函数http://imageontime.com/upload/big/2013/07/20/51ea60b522bba.jpg调整大小后，宽度和高度都超过屏幕的示例）全屏幕图像在高度上仍然超过屏幕几行（很少在宽度处）），所以我想询问是否有更好的rescale javascript函数或者是否有任何铬源专家谁可以查看铬源代码以从中获取图像大小调整功能所以我可以将其移植到javascript？

以下是代码：

function setautow() {
    img.style.width = 'auto';
    img.style.removeProperty("height");
    if (document.documentElement.clientHeight == 0) // Firefox again...
    {
        img.height = window.innerHeight;
    }
    else {
        img.height = document.documentElement.clientHeight;
    }
}

function setautoh() {
    img.style.height = 'auto';
    img.style.removeProperty("width");
    if (document.documentElement.clientWidth == 0) // FF
    {
        img.width = window.innerWidth;
    }
    else {
        img.width = document.documentElement.clientWidth;
    }
}

function shrink(a) {
    if (a) {
        if (img.width != document.documentElement.clientWidth) {
            setautoh();
        }
    }
    else {
        if (img.height != document.documentElement.clientHeight) {
            setautow();
        }
    }
}

var rescaled = false;

function rescale() {
    if (rescaled) {
        rescaled = false;
        img.height = img.naturalHeight;
        img.width = img.naturalWidth;
        img.style.removeProperty("height");
        img.style.removeProperty("width");
    }
    else {
        rescaled = true;
        if (img.naturalWidth > img.naturalHeight) {
            setautoh();
            setTimeout(function () {
                shrink(true);
            }, 0);
        }
        else {
            setautow();
            setTimeout(function () {
                shrink(false);
            }, 0);
        }
    }
}

Answer 1

以下似乎可以很好地完成这项工作，只要CSS中没有指定图像宽度/高度。

#Javascript
window.onresize = window.onload = function()
{
    resize();
}

function resize()
{
    var img    = document.getElementsByTagName('img')[0];
        winDim = getWinDim();


    img.style.height = winDim.y + "px";

    if (img.offsetWidth > winDim.x)
    {
        img.style.height = null;
        img.style.width = winDim.x + "px";
    }
}

function getWinDim()
{
    var body = document.documentElement || document.body;

    return {
        x: window.innerWidth  || body.clientWidth,
        y: window.innerHeight || body.clientHeight
    }
}

#CSS
body{
    margin:0;
    padding:0;
    text-align:center;
    background:rgb(51, 51, 51);
}

#HTML
<img src="http://placehold.it/4000x3000" />

Answer 2

最终取得了我想要的东西，非常适合FireFox + Chrome

编辑：嗯，非常适合大于屏幕的图像，可以处理它以便它可以处理较小的图像

function fit_to_screen()
{
    img.removeAttribute("style");
    var winX = window.innerWidth + "px";
    var winY = window.innerHeight + "px";
    var vbar = false;
    if (document.body.scrollHeight > document.body.clientHeight) // vertical scrollbar
    {
            img.style.height = winY;
            vbar = true;
    }
    if (document.body.scrollWidth > document.body.clientWidth) // horizontal scrollbar
    {
            if (vbar) // both scrollbars
            {
                    if ((document.body.scrollHeight - document.body.clientHeight) > (document.body.scrollWidth - document.body.clientWidth)) // let's see which one is bigger
                    {
                            img.removeAttribute("style");
                            img.style.height = winY;
                    }
                    else
                    {
                            img.removeAttribute("style");
                            img.style.width = winX;
                    }
            }
            else
            {
                    img.removeAttribute("style");
                    img.style.width = winX;
            }
    }
}

// bonus, switch between original size and fullscreen
var rescaled = false;

function rescale()
{
    if (rescaled)
    {
            rescaled = false;
            img.removeAttribute("style");
    }
    else
    {
            rescaled = true;
            fit_to_screen();
    }
}

适合图像在javascript中正确筛选

2 个答案: