zoukankan      html  css  js  c++  java
  • zepto判断手机横竖屏

    var CheckOrientation = (function(){
        var win = $( window ),
            get_orientation,
            last_orientation,
            initial_orientation_is_landscape,
            initial_orientation_is_default,
            portrait_map = { "0": true, "180": true },
            ww, wh, landscape_threshold;
    
        if(window.orientation !== undefined){
            ww = window.innerWidth || win.width();
            wh = window.innerHeight || win.height();
            landscape_threshold = 50;
    
            initial_orientation_is_landscape = ww > wh && ( ww - wh ) > landscape_threshold;
            initial_orientation_is_default = portrait_map[ window.orientation ];
    
            // (初始是横屏,方向是0或者180), *OR*
            // 初始是竖屏,方向是90或者-90, we
            //需要调整portrait_map
            if ( ( initial_orientation_is_landscape && initial_orientation_is_default ) || ( !initial_orientation_is_landscape && !initial_orientation_is_default ) ) {
              portrait_map = { "-90": true, "90": true };
            }
    
        }
          /**
           * 判断是横竖屏
           * @return {[type]} [description]
           */
        function get_orientation(){
            var isPortrait = true, elem = document.documentElement;
    
            if ( window.orientation !== undefined ) {
               
                isPortrait = portrait_map[ window.orientation ];
            } else {
                isPortrait = elem && elem.clientWidth / elem.clientHeight < 1.1;
            }
    
            return isPortrait ? "portrait" : "landscape";
        }
    
        last_orientation = get_orientation();
    
        function handler() {
            var orientation = get_orientation();
            if ( orientation !== last_orientation ) {
                last_orientation = orientation;
                win.trigger('orientation:change',[last_orientation]);//借用zepto的trigger事件
            }
        }
        window.addEventListener("onorientationchange" in window ? "orientationchange" : "resize", handler, false); 
        
        return {
            get_orientation : get_orientation
        }
    })();
    

      

    如何使用:

    (1)CheckOrientation.get_orientation() //返回的是“portrait”:表示竖屏,返回的是“landscape”表示横屏

    (2)$(window).on('orientation:change',function(e,type){//其中type值是portrait或者是landscape});//横竖屏转换的时候触发

  • 相关阅读:
    图片上传前预览、压缩、转blob、转formData等操作
    Vue背景图打包之后访问路径错误
    图片上传前预览的功能
    总结div里面水平垂直居中的实现方法
    IE浏览器报Promise未定义的错误、解决vuex requires a Promise polyfill in this browser问题
    普通项目转换成maven项目
    HTTP 错误 404.0
    电商项目系列文档(四):售后的设计(退换货)
    Sqlserver数据库还原.bak文件失败的两个问题
    数据库字段顺序的【坑】
  • 原文地址:https://www.cnblogs.com/xupeiyu/p/5417471.html
Copyright © 2011-2022 走看看