Javascript jQuery UI自动完成-在按下/按下键后访问输入的搜索词

如何访问用户输入的搜索词

我读过，但不明白

例如，用户在“sna”中键入，并获得包含自动完成候选项的菜单：

• 蛇
• 抢夺
• 金鱼

用户按下键，自动完成输入字段立即填充“snake”

此时，我想得到输入字段“sna”的上一个原始值

---

我如何才能做到这一点？（以编程方式，无需按ESC键）。

您可以使用

$.ui.autocomplete.escapeRegex（req.term）

它就像一个符咒，你是如何找到这个解决方案的？我的意思是，你怎么知道它在escapeRegex中？我阅读并找到了函数
escapeRegex
。
var wordlist= [ "about", "above", "across", "after", "against",
                "along", "among", "around", "at", "before", 
                "behind", "below", "beneath", "beside", "between"] ; 

$("#input1").autocomplete({
    // The source option can be an array of terms.  In this case, if
    // the typed characters appear in any position in a term, then the
    // term is included in the autocomplete list.
    // The source option can also be a function that performs the search,
    // and calls a response function with the matched entries.
    source: function(req, responseFn) {
        var re = $.ui.autocomplete.escapeRegex(req.term);
        alert(re); //THIS IS WHAT YOU WANT
        var matcher = new RegExp( "^" + re, "i" );
        var a = $.grep( wordlist, function(item,index){
            return matcher.test(item);
        });
        responseFn( a );
    }
});