如何注入jQuery，并在同一bookmarklet中使用它?

问题描述：

我可以使用以下书签将jQuery成功地注入页面:

I can successfully inject jQuery to a page with the following bookmarklet:

javascript: void((function(doc) {
    if (typeof jQuery == 'undefined') {
        var script_jQuery = document.createElement('script');
        script_jQuery.setAttribute('src', 'https://code.jquery.com/jquery-latest.min.js');
        Node.prototype.appendChild.call(document.body, script_jQuery);
        console.log('jQuery included ^_^');
    } else {
        console.log('jQuery already included ...');
    }
})(document));

有没有办法在同一bookmarklet中使用刚注入的jQuery?我尝试将 console.log(jQuery.toString())放在apend部分之后，但这没有用.在我看来，只有在完成书签后才能使用jQuery.

Is there a way to use the just injected jQuery within the same bookmarklet? I tried putting console.log(jQuery.toString()) after the apend part, but it didn't work. It seems to me that jQuery is only available for using after the bookmarklet finishes.

答

使用新脚本元素的 onload 回调来初始化您自己的jQuery代码

Use onload callback of the new script element to initialize your own jQuery code

(function(doc) {

  function doStuff() {
    console.log('jQuery version ', $.fn.jquery, ' loaded')
    $('h1').text('Updated Title').css('color', 'red');
  }

  if (typeof jQuery == 'undefined') {
    var script_jQuery = document.createElement('script');
    script_jQuery.src = 'https://code.jquery.com/jquery-latest.min.js';

    // call doStuff() after jQuery.js loads
    script_jQuery.onload = doStuff;

    doc.body.appendChild(script_jQuery);
    console.log('script_jQuery appended to body');
    
  } else {
    console.log('jQuery already included ...');
    // initialize your code using existing version
    doStuff();
  }
})(document)

<h1>Blank</h1>

如何注入jQuery，并在同一bookmarklet中使用它?

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