javascript 函数中的jquery变量
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jquery variable in function
提问by user1022585
On pageload I set a variable
在页面加载时我设置了一个变量
$(document).ready(function() {
var inv_count = 3;
});
When I try to refer to that variable inside functions though, it doesn't work.
但是，当我尝试在函数内部引用该变量时，它不起作用。
function blah(a,b) {
alert (inv_count);
}
Why is this? And how can I get around it?
为什么是这样？我怎样才能解决它？
(rookie here)
（这里是菜鸟）
回答by nicosantangelo
You have a problem of scope, I suggest you read a little about it because you can improve your javascript a ton, but you could solve it in two general ways:
你有一个scope问题，我建议你阅读一些关于它的内容，因为你可以大量改进你的 javascript，但你可以通过两种一般方式解决它：
var inv_count; //you declare your variable in a global scope, it's not very good practice
$(document).ready(function() {
inv_count = 3;
});
function blah(a,b) {
alert (inv_count);
}
or
或者
$(document).ready(function() {
var inv_count = 3;
function blah(a,b) {
alert (inv_count);
}
//you declare everything inside the scope of jQuery, if you want to acess blah outside use:
//window.blah = blah;
});
Also I recommend you read about clousuresif you don't know how they work.
另外，如果您不知道clouses是如何工作的，我建议您阅读有关closures 的内容。
回答by Michael Liu
If you declare a variable inside a function, the variable name will be inaccessible outside the scope of that function. Move the declaration outside the function:
如果在函数内部声明变量，则变量名称在该函数范围之外将无法访问。将声明移到函数外：
var inv_count;
$(document).ready(function() {
inv_count = 3;
});
