1.使用JSON自带的stringify()方法判断functionisEmptyObj(obj){returnJSON.stringify(obj)==='{}'}console.log('对象是否为空：',isEmptyObj({}))2.forin循环判断函数isEmptyObj(obj){for(letiteminobj){returntrue}returnfalse}console.log('对象是否为空:',isEmptyObj({}))3.使用ES6的Object.keys()方法functionisEmptyObj(obj){returnObject.keys(obj).length===0}console.log('对象是否为空：',isEmptyObj({}))4.Object.getOwnPropertyNames()methodfunctionisEmptyObj(obj){returnObject.getOwnPropertyNames(obj).length===0}console.log('对象是否为空：',isEmptyObj({}))
