js判断图片链接是否有效

 

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let checkImgExists = function(url) {       return new Promise(function(resolve, reject) {         let ImgObj = new Image();         ImgObj.src = url;         ImgObj.onload = function(res) {           resolve(res);         }         ImgObj.onerror = function(err) {           reject(err)         }       })     }       checkImgExists('//www.baidu.com/img/flexible/logo/pc/result.png').then(()=>{       //success callback       console.log('有效链接')     }).catch(()=>{       //fail callback       console.log('无效链接')     })