JavaScript中的var a = a || []具体的含义
if(a === 0 || a === "" || a === false || a === null || a === undefined){
        a = [];
} else {
        var a = a;

JavaScript中的var a = a || []具体的含义
if(a === 0 || a === "" || a === false || a === null || a === undefined){
        a = [];
} else {
        var a = a;