Some commonly used public methods of uniapp

Encapsulation code and call refer to this article: 

uniapp encapsulates public methods ( no need to refer to each page, call directly) 3001.5501

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Common methods: 

custom return page

(Using uni.navigateBack directly may report an error: When the page level is 1, it cannot return, so define it yourself)

//自定义返回页面
goBack: function() {
	var pages = getCurrentPages();
	if (pages.length > 1) {
		uni.navigateBack({
			delta: 1, //返回层数，2则上上页
		})
	} else {
		uni.switchTab({
			url: '/pages/home/index'
		})
	}
},

preview picture

(The value can be passed (image array, index) or single image src)

//预览图片
previewPic: function(picArray, index) {
	if (index == undefined) {
		let array = [];
		array.push(picItem);
		uni.previewImage({
			urls: array,
			current: array[0]
		});
	} else {
		uni.previewImage({
			urls: picArray,
			current: index
		});
	}
},