Question

如何实现javascript在head

Answer 1

// javascript.js
var head = document.head || document.getElementsByTagName('head')[0];
var script = document.createElement('script');
var style = document.createElement('style');
script.innerHTML = '$("div").wrapInner("<div>545454</div>");';
style.innerHTML = 'body{background-color:#f30;}';
head.appendChild(script);
head.appendChild(style);