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js 判斷物件是否為空字串

var ageForCheckbox;  // 不定義
var result = !ageForCheckbox || parseInt(ageForCheckbox) < 41
console.log("result = " + result); //true

var ageForCheckbox = null;  // 空
var result = !ageForCheckbox || parseInt(ageForCheckbox) < 41
console.log("result = " + result); //true
                  
var ageForCheckbox = "";  // 空字串
var result = !ageForCheckbox || parseInt(ageForCheckbox) < 41
console.log("result = " + result); //true
                  
var ageForCheckbox = "30";  // 正常賦值
var result = !ageForCheckbox || parseInt(ageForCheckbox) < 41
console.log("result = " + result); //true
                  
var ageForCheckbox = "60";  // 正常賦值
var result = !ageForCheckbox || parseInt(ageForCheckbox) < 41
console.log("result = " + result); //false