getJson问题，它返回未定义 [英] getJson problem, it returns undefined

问题描述

你好，我有这个代码

var temp;
if(method==1)
  temp = $("#Words").val();             //get the words from textbox
else{
  $.getJSON("http://localhost/mine/test.js", function(data) {
      temp=data.Words;
  });
}
//do something with temp...but temp is undefined after the execution of else

但是在执行getJson之后，温度是不确定的...如果我放了一个alert(temp)，它将继续发生什么事情?我该如何利用temp的价值来继续?

but temp is undefined after the execution of getJson...if i put an alert(temp) it continues whats going on? how can i take the value of temp to continue?

提前谢谢！

推荐答案

这是因为getJSON是ajax请求，而不是同步的.试试这个

it's because getJSON is ajax request, not synchronous. Try this

var temp;
if(method==1) {
  temp = $("#Words").val();             //get the words from textbox
  proc(temp);
} else {
  $.getJSON("http://localhost/mine/test.js", function(data) {
      temp=data.Words;
      proc(temp);
  });
}

function proc(data){
    //do something with temp...but temp is undefined after the execution of else
}

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