js 判斷物件是否為空字串
阿新 • • 發佈：2019-01-06
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