1.判断undefined:
if ( typeof AJAX_MONITOR != "undefined") { AJAX_MONITOR.PDC.init({ product_id : 234, //产品线id sample : 1,//采样率,范围0-1。计算方法:100万/页面PV max : 2//一次最大上传个数 }); }
var platform = platform_setting_json[data.PLATFORM_TYPE]; if (typeof(platform) == "undefined") { return "未定义"; } else { return platform; }
2.判断null:
var platform = platform_setting_json[data.PLATFORM_TYPE]; if (typeof(platform) != "undefined" && !platform && tplatformmp != 0) { return "null"; } else { return platform; }
3.判断NaN:
var platform = platform_setting_json[data.PLATFORM_TYPE]; if (isNaN(parseInt(platform)) { return "NaN"; } else { return platform; }