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📜  javascript 检查是否在数组中 - Javascript 代码示例

📅  最后修改于: 2022-03-11 15:01:25.982000             🧑  作者: Mango

代码示例6
var extensions = ["image/jpeg","image/png","image/gif"];          
if(extensions.indexOf("myfiletype") === -1){
    alert("Image must be .png, .jpg or .gif");
}