load js by sequence

load js by sequence

scripts.push("js/index.js");
scripts.push("js/txt.js");
function load_js (scripts) {
  var scriptsEle = [];
  var h = document.getElementsByTagName('head')[0];
  scripts.forEach(function (val, index) {
    var js = document.createElement('script');
    js.type = "text/javascript";
    h.appendChild(js);
    scriptsEle[index] = js;
    if(index > 0) {
      scriptsEle[index-1].onload = function () {
        js.src = val;
      }
    }
  });
  scriptsEle[0].src = scripts[0];
}