博客

<script>
	const request = function(){
		var _this = this;
		let num = Math.round(Math.random()*100)/100;
		console.log( num );
		return new Promise( (resolve, reject) => {
			setTimeout(function(){
				num < 0.5 ? resolve('1234567') : reject('abcdefg');
			}, 500);
		});
	}

	// var getdata = new request();
	request().then( val => {
		console.info( val );
	}, val => {
		console.info( val );
	}).catch( err => {
		console.info( err );
	});
</script>

Promise


对象

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