随笔2

function timeout(nums){
    return new Promise(function(resolve,reject){
        setTimeout(resolve,nums);
    })
};
var m=timeout(1000).then(()=>{console.log(true)}).catch(()=>{console.log(false)}).finally(()=>{console.log("111")})

function loadImg(src) {
    const p = new Promise((resolve, reject) => {
        const image = document.createElement(‘img‘); 
        image.src = src;  
        image.onload = () => { 
            resolve(image); 
        };
        image.onerror = () => {  
            reject(new Error(‘url not found‘)); 
        }
    });
    return p;
}
loadImg(‘http://pic15.nipic.com/20110628/1369025_192645024000_2.jpg‘).then((data) => {
    document.body.appendChild(data); 
    data.style.width = ‘900px‘;
    data.style.height = ‘500px‘;
}).catch((err) => {
    console.log(err); 
});

随笔2

原文：https://www.cnblogs.com/zygege/p/10687639.html