jQuery：按顺序加载脚本

我正在尝试使用jQuery动态加载一些脚本：

var scripts = ['script1.js','script2.js','script3.js'];
 
$.each(scripts,function(i,val) {
     $.getScript(val,function() {
     console.log('loaded '+ val);
});

但有时,加载脚本的顺序会更改.上一个成功加载后,如何加载每个脚本？

解决方法

通过使用$.getScript()的回调函数作为递归函数调用,可以在上一次加载完成后加载.

//setup array of scripts and an index to keep track of where we are in the process
var scripts = ['script1.js','script3.js'],index   = 0;
 
//setup a function that loads a single script
function load_script() {
 
    //make sure the current index is still a part of the array
    if (index < scripts.length) {
 
        //get the script at the current index
        $.getScript(scripts[index],function () {
 
            //once the script is loaded,increase the index and attempt to load the next script
            console.log('Loaded: ' + scripts[index]);
            index++;
            load_script();
        });
    }
}

您的代码中发生的是脚本在同一时间被请求,并且由于它们异步加载,它们以随机顺序返回并执行.

更新

我没有测试过,但是如果脚本在本地托管,那么您可以尝试以纯文本方式检索它们,然后将所有代码存储在变量中,直到它们全部加载为止,才能按顺序评估脚本：

var scripts   = ['script1.js',//setup object to store results of AJAX requests
    responses = {};
 
//create function that evaluates each response in order
function eval_scripts() {
    for (var i = 0,len = scripts.length; i < len; i++) {
        eval(responses[scripts[i]]);
    }
}
 
$.each(scripts,function (index,value) {
    $.ajax({
        url      : scripts[index],//force the dataType to be `text` rather than `script`
        dataType : 'text',success  : function (textScript) {
 
            //add the response to the `responses` object
            responses[value] = textScript;
 
            //check if the `responses` object has the same length as the `scripts` array,//if so then evaluate the scripts
            if (responses.length === scripts.length) { eval_scripts(); }
        },error    : function (jqXHR,textStatus,errorThrown) { /*don't forget to handle errors*/ }
    });
});

jQuery：按顺序加载脚本

解决方法

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