function loadImageAsync(url){
return new Promise((resolve,reject)=>{
let image=new Image();
image.onload=function(){
resolve(image);
};
image.onerror=function(){
reject(new Error('Could not image at'+url));
}
image.src=url;
})
}
Promise异步加载图片
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转载自blog.csdn.net/qq_41805715/article/details/84677229
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