JavaScript根據(jù)CSS的MediaQueries來判斷瀏覽設(shè)備的方法_html/css_WEB-ITnose

/* default state */.state-indicator { position: absolute; top: -999em; left: -999em; z-index: 1;} /* small desktop */@media all and (max-width: 1200px) { .state-indicator { z-index: 2; }} /* tablet */@media all and (max-width: 1024px) { .state-indicator { z-index: 3; }} /* mobile phone */@media all and (max-width: 768px) { .state-indicator { z-index: 4; }}

// Create the state-indicator elementvar indicator = document.createElement('div');indicator.className = 'state-indicator';document.body.appendChild(indicator); // Create a method which returns device statefunction getDeviceState() { return parseInt(window.getComputedStyle(indicator).getPropertyValue('z-index'), 10);}getDeviceState() 函數(shù)返回的就是 z-index 的值，為了增強(qiáng)一下可讀性，可以用 switch 函數(shù)來規(guī)范

if(getDeviceState() == 'tablet') { // 平板電腦下執(zhí)行的 JavaScript 代碼}

$(function(){ $('body').append(''); function getDeviceState() { switch(parseInt($('.state-indicator').css('z-index'),10)) { case 2: return 'small-desktop'; break; case 3: return 'tablet'; break; case 4: return 'phone'; break; default: return 'desktop'; break; } } console.log(getDeviceState()); $('.state-indicator').remove();});