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) {
$.getScript(val, function() {
console.log('loaded '+ val);
});
但是有时加载脚本的顺序会发生变化。前一个脚本成功加载后,如何加载每个脚本?
回答:
您可以通过使用回调函数$.getScript()
作为递归函数调用在前一个完成加载后加载每个。
//setup array of scripts and an index to keep track of where we are in the processvar scripts = ['script1.js','script2.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();
});
}
}
在您的代码中发生的是,脚本是同时被请求的,并且由于它们是异步加载的,因此它们以随机顺序返回并执行。
更新资料
我尚未对此进行测试,但是如果脚本是在本地托管的,则可以尝试以纯文本格式检索它们,然后将所有代码存储在变量中,直到它们全部加载完毕为止,然后可以按顺序评估脚本:
var scripts = ['script1.js','script2.js','script3.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*/ }
});
});
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