javascript,jQuery - 检查数组中是否存在值

Question

有没有更好的方法来检查多个项匹配if语句中的变量

我有3个if语句,我需要查看一个项是否匹配一个名为code的数组/变量.有很多项要与代码数组/变量进行比较,所以我不得不用|来复制每一个 它们之间.有没有更有效的方法或者我可以使用一次数组来检查代码是否等于数组中的任何项目？

这就是我所拥有的

onLabelShow: function(event, label, code){
        if (code == "US-AL" | code == "US-AZ" | code == "US-CA" | code == "US-CT" | code == "US-FL" | code == "US-HI" | code == "US-ID" | code == "US-IL" | code == "US-IA" | code == "US-LA" | code == "US-ME" | code == "US-MD" | code == "US-MA" | code == "US-MO" | code == "US-NE" | code == "US-NV" | code == "US-NJ" | code == "US-NM" | code == "US-NY" | code == "US-OH" | code == "US-OK" | code == "US-OR" | code == "US-PA" | code == "US-TN" | code == "US-UT" | code == "US-VA" | code == "US-CA" | code == "US-WA" | code == "US-NC" ) {
            //do nothing
        }
        else if (code) { //if a state is not specified in var stateRedirects then prevent default
            event.preventDefault();
        }                   
    },      
    onRegionOver: function(event, code){
        if (code == "US-AL" | code == "US-AZ" | code == "US-CA" | code == "US-CT" | code == "US-FL" | code == "US-HI" | code == "US-ID" | code == "US-IL" | code == "US-IA" | code == "US-LA" | code == "US-ME" | code == "US-MD" | code == "US-MA" | code == "US-MO" | code == "US-NE" | code == "US-NV" | code == "US-NJ" | code == "US-NM" | code == "US-NY" | code == "US-OH" | code == "US-OK" | code == "US-OR" | code == "US-PA" | code == "US-TN" | code == "US-UT" | code == "US-VA" | code == "US-CA" | code == "US-WA" | code == "US-NC" ) {
            //do nothing
        }
        else if (code) { //if a state is not specified in var stateRedirects then prevent default
            event.preventDefault();
        }                   
    },
    onRegionClick: function (event, code) {
        if (code == "US-AL" | code == "US-AZ" | code == "US-CA" | code == "US-CT" | code == "US-FL" | code == "US-HI" | code == "US-ID" | code == "US-IL" | code == "US-IA" | code == "US-LA" | code == "US-ME" | code == "US-MD" | code == "US-MA" | code == "US-MO" | code == "US-NE" | code == "US-NV" | code == "US-NJ" | code == "US-NM" | code == "US-NY" | code == "US-OH" | code == "US-OK" | code == "US-OR" | code == "US-PA" | code == "US-TN" | code == "US-UT" | code == "US-VA" | code == "US-CA" | code == "US-WA" | code == "US-NC" ) {
            window.location = '/' + code;
        }
        else if (code) { //if a state is not specified in var stateRedirects then prevent default
            //event.preventDefault();
        }   

    }   

任何帮助,示例或代码将不胜感激!我已经尝试过为每个人做,但认为我不知道足以让它与数组一起工作.

Answer 1

var codes = ["US-AL", "US-AZ", ... ];


if($.inArray(code, codes) > -1){
    //do something    
}

更新: 纳入@Deestan的建议,这可以重写为..

function isValidCode(code){
    return ($.inArray(code, codes) > -1);
}

Answer 2

是的

array.indexOf(searchElement[, fromIndex])