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Transform in CSS3 and javascript

高洛峰Original: 2016-11-30 16:23:031521browse

In javascript, WebkitTransform is roughly equivalent to transform . transform is standard and WebkitTransform is available for Webkit browsers. WebkitTransform in js corresponds to the -webkit-transform attribute in css.

The transform attribute in CSS applies a 2D or 3D transformation to an element. This property allows us to rotate, scale, move or tilt the element.

First look at a piece of code that does not move the div:

<style>
        #hovertreetf {
            border: 1px solid red;
            width: 120px;
            height: 120px;
        }
    </style><div id="hovertreetf">这是一个div，没有移动。何问起</div>

The transform attribute in css can move the div. For example:

<style>
        #hovertreetf {
            border: 1px solid red;
            width: 120px;
            height: 120px;
            transform: translateX(100px);
        }
    </style><div id="hovertreetf">这是一个div，使用css属性transform移动。何问起</div>

where transform:translateX(100px) means that the div element with id hovertreetf moves horizontally to the right by 100 pixels.

You can also use js to operate the transform attribute to move the div, and the effect is the same as using css above. For example:

<style>
        #hovertreetf {
            border: 1px solid red;
            width: 120px;
            height: 120px;
        }
    </style><div id="hovertreetf">这是一个div，使用js操作transform移动。何问起</div>
    <script>
        document.getElementById("hovertreetf").style.transform = "translateX(100px)";
    </script>

As mentioned above, WebkitTransform is roughly equivalent to transform and is suitable for Webkit browsers. Using js to operate WebkitTransform can also make divs move. For example:

<style>
        #hovertreetf {
            border: 1px solid red;
            width: 120px;
            height: 120px;
        }
    </style><div id="hovertreetf">这是一个div，使用js操作WebkitTransform移动。何问起</div>
    <script>
        document.getElementById("hovertreetf").style.WebkitTransform = "translateX(100px)";
    </script>

WebkitTransform corresponds to the -webkit-transform attribute in css, for example:

<style>
        #hovertreetf {
            border: 1px solid red;
            width: 120px;
            height: 120px;
            -webkit-transform: translateX(100px);
        }
    </style><div id="hovertreetf">这是一个div，使用css属性 -webkit-transform 移动。何问起</div>

If you only use css to set the transform, but js does not set it, then js gets the transform attribute value to be empty, for example:

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <title>关于css设置transform然后用js获取的代码_何问起</title>
    <meta charset="utf-8" />
    <style>
        #hovertreetf {border: 1px solid red;width: 120px;height: 120px;transform: translateX(100px);}
        #hovertreereusult{border:1px solid green;min-height:40px;margin:5px 0px;}
    </style>
</head>
<body>
    <div id="hovertreetf">这是一个div，使用css属性transform移动。js获取transform值为空。何问起</div>
    <div id="hovertreereusult"></div>
    <input type="button" value="获取transform属性值" id="hovertreeget" />
    <script>
        document.getElementById("hover"+"treeget").addEventListener("click", function () {

            var h_transformValue = document.getElementById("hovertreetf").style.transform;

            //如果获取到的是空字符串，则修改为文字：空
            if (h_transformValue == "")
                h_transformValue = "空";

            document.getElementById("hovertreereusult").innerText = "上面div的transform属性值为："+h_transformValue;
        })
    </script>
</body>
</html>
体验效果：http://hovertree.com/texiao/javascript/3/6.htm

如果先使用js设置了transform的值，则js可以获取到所设置的值。例如：
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <title>关于js设置transform然后用js获取的代码_何问起</title>
    <meta charset="utf-8" />
    <style>
        #hovertreetf {border: 1px solid red;width: 120px;height: 120px;}
        #hovertreereusult{border:1px solid green;min-height:40px;margin:5px 0px;}
    </style>
</head>
<body>
    <div id="hovertreetf">这是一个div，使用js设置transform使它移动。js可获取所设置的transform值。何问起</div>
    <div id="hovertreereusult"></div>
    <input type="button" value="获取transform属性值" id="hovertreeget" />
    <script>
        document.getElementById("hovertreetf").style.transform = "translateX(50px)";

        document.getElementById("hover"+"treeget").addEventListener("click", function () {
            var h_transformValue = document.getElementById("hovertreetf").style.transform;

            //如果获取到的是空字符串，则修改为文字：空
            if (h_transformValue == "")
                h_transformValue = "空";

            document.getElementById("hovertreereusult").innerText = "上面div的transform属性值为："+h_transformValue;
        })
    </script>
</body>
</html>

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