How to use 'loadjson javascript' in JavaScript

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function loadJS(src){
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    var node = DOC.createElement('script');
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    node.src = src;
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    node.async = true;
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    jsOnload(node, function() {
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        HEAD.removeChild(node); 
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    });
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    HEAD.insertBefore(node, HEAD.firstChild);
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}

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function loadJs(): void {
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  let jsTotal = 0;
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  let canCancel = false;
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  jsList.forEach((jsUrl, index) => {
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    loadAsset(jsUrl, index, false, jsRoot, (err: any) => {
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      // has error or current App is unmounted, cancel load css
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      if (canCancel) return;
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      canCancel = jsCallback(err);
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      // make sure css loads after all js have been loaded under shadowRoot
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      jsTotal++;
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      if (useShadow && jsTotal === jsList.length) {
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        loadCss();
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      }
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    });
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  });
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}