js 比较对象相等

//比较两个对象是否相等
var isObjectEquals = function(left, right){
    if(left == right){
        return true; 
    }
    if(typeof(right)=="undefined"||right==null||typeof(right)!="object"){
        return false;
    }
    var leftLen = 0;
    var rightLen = 0;
    for(var key in left) {
        leftLen++; 
    }
    for(var key in right) {
        rightLen++; 
    }
    if(leftLen != rightLen){
        return false; 
    }

    if(right.constructor == left.constructor){
        for(var key in left){
            if(typeof(left[key])=="object") {
                if(!isObjectEquals(left[key], right[key])){
                    return false;
                }
            }
            else if(typeof(left[key])=="function"){ 
                if(!isObjectEquals(left[key].toString(), right[key].toString())){
                    return false; 
                }
            }
            else if(left[key]!=right[key]){
                return false;
            }
        }
        return true; 
    }
    return false; 
};