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JS實(shí)現(xiàn)動態(tài)加載樣式和腳本

更新時(shí)間：2023年09月12日 08:19:37 作者：編程三昧

在前端開發(fā)的過程中,不可避免的需要根據(jù)前置條件動態(tài)加載樣式和腳本文件,本文小編就來簡單為大家介紹一下實(shí)現(xiàn)一下動態(tài)加載樣式和腳本文件的方法吧

動態(tài)加載樣式文件

使用以下腳本可實(shí)現(xiàn)頁面CSS文件的動態(tài)加載。

function loadStyle(url) {
  try {
    document.createStyleSheet(url);
  } catch (e) {
    var cssLink = document.createElement("link");
    cssLink.rel = "stylesheet";
    cssLink.type = "text/css";
    cssLink.href = url;
    var head = document.getElementsByTagName("head")[0];
    head.appendChild(cssLink);
  }
}

動態(tài)加載腳本文件

function appendscript(src, text, reload, charset) {
  var id = hash(src + text);
  if (!reload && in_array(id, evalscripts)) return;
  if (reload && $(id)) {
    $(id).parentNode.removeChild($(id));
  }
  evalscripts.push(id);
  var scriptNode = document.createElement("script");
  scriptNode.type = "text/javascript";
  scriptNode.id = id;
  scriptNode.charset = charset
    ? charset
    : BROWSER.firefox
    ? document.characterSet
    : document.charset;
  try {
    if (src) {
      scriptNode.src = src;
      scriptNode.onloadDone = false;
      scriptNode.onload = function() {
        scriptNode.onloadDone = true;
        JSLOADED[src] = 1;
      };
      scriptNode.onreadystatechange = function() {
        if (
          (scriptNode.readyState == "loaded" ||
            scriptNode.readyState == "complete") &&
          !scriptNode.onloadDone
        ) {
          scriptNode.onloadDone = true;
          JSLOADED[src] = 1;
        }
      };
    } else if (text) {
      scriptNode.text = text;
    }
    document.getElementsByTagName("head")[0].appendChild(scriptNode);
  } catch (e) {}
}
function appendscript(src, text, reload, charset) {
  var id = hash(src + text);
  if (!reload && in_array(id, evalscripts)) return;
  if (reload && $(id)) {
    $(id).parentNode.removeChild($(id));
  }
  evalscripts.push(id);
  var scriptNode = document.createElement("script");
  scriptNode.type = "text/javascript";
  scriptNode.id = id;
  scriptNode.charset = charset
    ? charset
    : BROWSER.firefox
    ? document.characterSet
    : document.charset;
  try {
    if (src) {
      scriptNode.src = src;
      scriptNode.onloadDone = false;
      scriptNode.onload = function() {
        scriptNode.onloadDone = true;
        JSLOADED[src] = 1;
      };
      scriptNode.onreadystatechange = function() {
        if (
          (scriptNode.readyState == "loaded" ||
            scriptNode.readyState == "complete") &&
          !scriptNode.onloadDone
        ) {
          scriptNode.onloadDone = true;
          JSLOADED[src] = 1;
        }
      };
    } else if (text) {
      scriptNode.text = text;
    }
    document.getElementsByTagName("head")[0].appendChild(scriptNode);
  } catch (e) {}
}