<Meta charset="UTF-8">

var script_arr = ['http://cdn.bootcss.com/jquery/3.1.0/jquery.slim.js','http://cdn.bootcss.com/jquery/3.0.0-rc1/jquery.js','http://cdn.bootcss.com/jquery/3.0.0-beta1/jquery.slim.min.js']; var nums = script_arr.length; var start = 0; for(var i in script_arr){ var script = document.createElement('script'); script.src = script_arr[i]; (function(j){ document.body.appendChild(script); script.onload = function(){ start++; if(start == nums){ console.log('全部加载完成'); } document.getElementById('loading').style.width = (start/nums)*100 + '%'; }; script.onerror = function(){ start++; console.log(srcript_arr[j] + '失败'); document.getElementById('loading').style.width = (start/nums)*100 + '%'; } })(i);

}