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Three ways JavaScript determines whether a picture is loaded (go)

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First, the Load event
12345678910111213141516 <!DOCTYPE HTML>    <meta charset="utf-8">    <title>img - load event</title><body>    "img1"src="http://pic1.win4000.com/wallpaper/f/51c3bb99a21ea.jpg">    <p id="p1">loading...</p>    <script type="text/javascript">        img1.onload = function() {            p1.innerHTML = ‘loaded‘        }    </script></body>

Test, all browsers show "loaded", indicating that all browsers support IMG's Load event.

Ii. ReadyStateChange Events
123456789101112131415161718 <!DOCTYPE HTML>    <meta charset="utf-8">    <title>img - readystatechange event</title><body>    "img1"src="http://pic1.win4000.com/wallpaper/f/51c3bb99a21ea.jpg">    <p id="p1">loading...</p>    <script type="text/javascript">        img1.onreadystatechange = function() {            if(img1.readyState=="complete"||img1.readyState=="loaded"){                p1.innerHTML = ‘readystatechange:loaded‘            }        }    </script></body>

ReadyState for complete and loaded indicates that the picture has been loaded. The test Ie6-ie10 supports this event and is not supported by other browsers.

Third, the Complete property of img
123456789101112131415161718192021222324 <!DOCTYPE HTML>    <meta charset="utf-8">    <title>img - complete attribute</title><body>    "img1"src="http://pic1.win4000.com/wallpaper/f/51c3bb99a21ea.jpg">    <p id="p1">loading...</p>    <script type="text/javascript">        functionimgLoad(img, callback) {            vartimer = setInterval(function() {                if(img.complete) {                    callback(img)                    clearInterval(timer)                }            }, 50)        }        imgLoad(img1, function() {            p1.innerHTML(‘加载完毕‘)        })    </script></body>

Polling continuously monitors the complete property of IMG and, if true, indicates that the picture has been loaded and stopped polling. This property is supported by all browsers.

<!DOCTYPE HTML>

    <meta charset="utf-8">    <title>img - complete attribute</title><body>    "img1" src="http://pic1.win4000.com/wallpaper/f/51c3bb99a21ea.jpg">    <p id="p1">loading...</p>    <script type="text/javascript">        function imgLoad(img, callback) {            vartimer = setInterval(function() {                if(img.complete) {                    callback(img)                    clearInterval(timer)                }            }, 50)        }        imgLoad(img1, function() {            p1.innerHTML(‘加载完毕‘)        })    </script></body>

Three ways JavaScript determines whether a picture is loaded (go)

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