uniapp-h5 file copy link, preview, download and other functions

1. Copy link

Main function code: document.execCommand('Copy');

		copy() {
			console.log('复制');
			var inputTest = document.createElement('input');
			inputTest.value = this.copyUrl;
			// inputTest.value='11111111111';
			document.body.appendChild(inputTest);
			inputTest.select();
			document.execCommand('Copy');
			uni.showToast({
				title: '复制成功',
				icon: 'none'
			});
		},

2. File preview

Requirements: It needs to be displayed in the pop-up box, so it must be able to be nested into the ui component, and it should be opened on this page without jumping to a new page

So the iframe tag used

<u-popup :show="show_three" :round="10" :zIndex="zIndex_three" style='padding: 40rpx;' @close="close_three" >
			<view class="popup_three" >
				<view class="title">文件预览</view>
				<iframe :src="copyUrl" width='100%' height='400rpx'></iframe></view>
		</u-popup>

The web-view used at the beginning

But it cannot be nested into other ui components, so it does not meet the requirements

<template v-if='show_three'>
							<view class="" style="padding: 20rpx;">
								<web-view :src="copyUrl" ></web-view>
							</view>
					  	</template> 

3. File download