辛巴.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

</body>
</html>
<script>
    var a=Symbol('a')
    var b=Symbol('a')
    console.log(a === b);

    function timeout(ms) {
        return new Promise((resolve, reject) => {
            setTimeout(resolve, ms, 'done');
        });
    }

    timeout(100).then((value) => {
        console.log(value);
    });


    function loadimg() {
        var img=new Image();
         img.onload=function () {
            console.log('我日');
        };
        img.onerror=function () {
            console.log('我日1');
        };
         img.src='http://img.zcool.cn/community/01ceff57bdaa2a0000012e7ea5534a.jpg@2o.jpg' ;
    }
    loadimg();


    function loadImageAsync(url) {
        return new Promise(function(resolve, reject) {
            const image = new Image();

            image.onload = function() {
                resolve(image);
            };

            image.onerror = function() {
                reject(new Error('Could not load image at ' + url));
            };

            image.src = url;
        });
    }
    loadImageAsync('http://img.zcool.cn/community/01ceff57bdaa2a0000012e7ea5534a.jpg@2o.jpg' ).then(function (a) {
        console.log(a);
    },function (e) {
        console.log(e);
    })
</script>