php - JavaScript isset() function -


इस सवाल का पहले से ही एक उत्तर है: < / P>

  • 14 उत्तरों

    कैसे जांचें Isset जावास्क्रिप्ट में।

    मैंने निम्नलिखित तरीके से उपयोग किया है। 

      var sessionvalue = document.getElementById ('sessionvalue')। मूल्य; यदि (यहाँ मुझे जांचना है कि क्या सत्र का संस्करण जारी है या नहीं) {यदि (सत्रव्यू == "" || सत्रव्यू == शून्य) {document.getElementById ('sessionvalue')। Style.borderColor = "red"; विवरण झूठा है; } और {document.getElementById ('सत्रव्यू')। Style.borderColor = "# ccc"; }}    
     
     
     जब जावास्क्रिप्ट चर घोषित नहीं किए जाते हैं और आप उन्हें कॉल करने का प्रयास करते हैं, तो वे वापस आते हैं  अपरिभाषित , तो आप ऐसा कर सकते हैं:  
      यदि (सत्र का प्रकार == "अपरिभाषित" || सत्रव्यू == रिक्त)

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